Contamination of heavy metals on the soil leads to an increase in its acidity. Vermicompost appl... more Contamination of heavy metals on the soil leads to an increase in its acidity. Vermicompost application is commonly used to improve the properties of soil. The study was carried out to determine the reduction of the acidity in Pb and Cd contaminated soils under the application of vermicompost. Two laboratory experiments were set using Completely Randomized Design (CRD) with two factors. The first factor was soil samples, vis Inceptisols, and Entisols, and the second factor was the rates of vermicompost, consisted of 0, 5, 10, 15 g kg-1. The treatment combination was repeated three times. The soils were pretreated with 10 mg kg-1 Pb or Cd using Pb(NO3)2 and Cd(NO3)2. Three hundred kg soil sample was incorporated with vermicompost and placed in a 500 ml plastic bottle. The mixtures were incubated for eight weeks, and the moisture of the soil was maintained at field capacity. The acidity and soil temperature were monitored every week. The study indicated that Pb contaminated soil acid...
Naturalis: Jurnal Penelitian Pengelolaan Sumber Daya Alam dan Lingkungan
Penelitian ini bertujuan untuk (1) Mengetahui porsi daerah Imbuhan air tanah (Groundwater Recharg... more Penelitian ini bertujuan untuk (1) Mengetahui porsi daerah Imbuhan air tanah (Groundwater Recharge Area) di Kota Bengkulu dan Kabupaten Bengkulu Tengah dalam RTRW Kota Bengkulu dan Kabupaten Bengkulu Tengah. (2) Mengetahui kesesuaian penggunaan lahan Kota Bengkulu dan Kabupaten Bengkulu Tengah terhadap daerah Imbuhan air tanah (Groundwater Recharge Area). (3) Mengetahui kesesuaian daerah Imbuhan air tanah (Groundwater Recharge Area) dengan RTRW Kota Bengkulu dan Kabupaten Bengkulu Tengah. Penelitian ini dilaksanakan pada bulan Maret – April 2020 di Kota Bengkulu dan Kabupaten Bengkulu Tengah. Data yang digunakan dalam penelitian ini antara lain adalah data Demnas, Peta Geologi dan Citra Satelite Spot Perekaman Tahun 2016. Data Demnas di ektraksi melalui analisis spasial sehingga menghasilkan data, Linement Density, Drainage Density dan Slope Gradient, kemudian data Geologi diturunkan menjadi data Lithologi serta data Citra Satelite di ekstraksi menjadi data tutupan lahan. 5 paramet...
Abstract— This study aimed to determine relations between texture and organic carbon to the water... more Abstract— This study aimed to determine relations between texture and organic carbon to the water content measured using the field and laboratory methods for highland soils in Sumatera, Indonesia. Five locations covered with different annual crops were selected for the measurements of actual soil water content and the sample collections for the laboratory analyses. Soil water content was first determined in situ by measuring the electrical impedance Z (in kΩ) using a portable impedance meter and converting the data into soil water content θ (g.g-1) according to the following equation: θ = a.Zb where a = 0.45 and b = -0.15. A soil sample was then taken from the same point and soil depth of the dielectric measurement, put tightly in the plastic bag and brought to the laboratory for the analyses of field soil water content, texture, and carbon organic. The measurement and sampling were repeated at ten points for each location; therefore there were 50 pairs of data collected in this stu...
Abstract—Soil water content can be expressed as the ratio of water and dry soil on the volumetric... more Abstract—Soil water content can be expressed as the ratio of water and dry soil on the volumetric or mass (gravimetric) basis. The profile of soil water content refers to the volume of water held in the soil profile between field capacity and permanent wilting point in a defined depth of soil. This research aimed to compare temporal and vertical changes in soil water content profiles on the volumetric basis at four soils with different texture classes during a discharged period. The research was conducted in North Bengkulu Region during a discharged period of May-to-July 2019. Four soil profiles were described to determine characteristics of soil layers up to the depth of 100 cm. Disturbed and undisturbed soil samples were taken from 10 cm intervals; therefore there were 40 soil samples were used for the laboratory analyses of bulk density, texture and organic carbon content. Soil electrical impedance values (Z, in k) were measured every week at corresponding depths using a dielectr...
Jeruk gerga merupakan komoditas hortikultura lokal unggulan Kabupaten Lebong Provinsi Bengkulu ya... more Jeruk gerga merupakan komoditas hortikultura lokal unggulan Kabupaten Lebong Provinsi Bengkulu yang mempunyai keunggulan kompetitif yaitu buahnya berwarna kuning-orange, berbuah sepanjang tahun, berat buah mencapai 200-350 gram, kadar sari buah tinggi dan mempunyai permintaan pasar yang tinggi. Jeruk Gerga telah ditetapkan sebagai komoditas prioritas nasional untuk dikembangkan pada tahun 2011. Kualitas buah jeruk sangat dipengaruhi oleh beberapa faktor yaitu: varietas, lingkungan, pupuk, umur panen, waktu, dan suhu penyimpanan serta penanganan selanjutnya. Tujuan penelitian ini adalah untuk mengetahui hubungan antara sifat fisik dan kimia tanah pada zona perakaran dengan kualitas buah jeruk gerga. Penelitian ini dilaksanakan pada bulan Maret sampai Mei 2016 di Kecamatan Rimbo Pengadang Kabupaten Lebong. Varietas yang ditanam pada lahan tersebut adalah varietas gerga yaitu pada 3 lokasi kebun dengan umur yang berbeda ± 4,5 dan 3 tahun dengan 60 pohon dipilih sebagai sampel. Variabel...
Penggunaan pupuk sintetik dalam jangka panjang dapat merusak tanah dan menurunkan hasil tanaman s... more Penggunaan pupuk sintetik dalam jangka panjang dapat merusak tanah dan menurunkan hasil tanaman sehingga tanah tidak mampu lagi meningkatkan produktivitasnya. Hal ini menuntut kita untuk mencari teknologi alternatif yang mampu mengurangi penggunaan pupuk sintetik adalah dengan menggunakan bahan organik. Namun kebutuhan unsur hara yang di butuhkan oleh tanaman tidak semuanya dapat dipenuhi oleh pupuk organik sehingga penggunaannya perlu dikombinasikan dengan pupuk sintetik. Tujuan penelitian ini adalah untuk mendapatkan kombinasi dosis pupuk organik padat dan pupuk nitrogen terhadap sifat-sifat kimia tanah serta pertumbuhan dan hasil sawi. Penelitian ini dilaksanakan pada bulan Juni-September 2016 di rumah kaca dan Laboratorium Ilmu Tanah Universitas Bengkulu. Tanah yang digunakan adalah Ultisol yang berasal dari daerah Kandang Limun Kecamatan Muara Bangkahulu. Pada penelitian ini digunakan benih sawi (panah merah) yang ditanam pada polibag yang disusun berdasarkan Rancangan Acak Len...
The objective of the study were to know the present existence of flowering condition of Rafflesia... more The objective of the study were to know the present existence of flowering condition of Rafflesia arnoldii R. Br. habitat in Bengkulu, Indonesia. The study was conducted in 1998 within 3 District in Bengkulu. The method of the study was a survey. Primary data was collected by the questionare to the peoples who live in the surrounding of habitat, however, the secondary data was collected through government office and study literature. As the results, the distribution of rafflesia habitats observed during the study in Bengkulu were divided into eight locations, three habitats locatated in lowland, and five habitats located in highland area. To protect and preserve the habitats, sign board, fenching, and reintroduction of the host vine of Liana plant are important. The population growth, education and ethnic background of the local community have induced destruction of raflesia habitats. Intensity of information delivery from the local government contribute to the willingness of protecting rafflesia flower. The establishment of infrastructure (roads and electricity) is desired for the use of rafflesia flowers as a tourist attraction.
Sektor pertanian mampu memberikan sumbangan besar bagi perekonomian Indonesia. Salah satu subsekt... more Sektor pertanian mampu memberikan sumbangan besar bagi perekonomian Indonesia. Salah satu subsektor penting dari sektor pertanian adalah perkebunan yang cakupan usahanya mencapai lebih dari seratus komoditas.Beberapa jenis komoditas perkebunan mampu memberikan kontribusi besar bagi perekonomian negara seperti karet, kopi, kakao dan kelapa sawit. Kelapa sawitmerupakan salah satu komoditas yang perkembangannya paling pesat,sehingga prospek usaha kelapa sawit sangat baik untuk dikembangkan. Penelitian ini bertujuan untuk mengevaluasi keeratan hubungan antara keragaan tanaman kelapa sawit menghasilkan dengan beberapa faktor pembatas kesesuaian lahan. Penelitian inidilaksanakan di Desa Talang Tengah, Kecamatan Pondok Kubang, Kabupaten Bengkulu Tengah, Provinsi Bengkulu.Lima Puluh tanaman dengan berbagai keragaan vegetatif dan generatif dipilih sebagai sampel. Pada jarak 2 meter dari setiap sampel tanaman kelapa sawit, contoh tanah utuh dan terganggu diambil dari kedalaman 0-20 cm masing-masing menggunakan ring sampel dan bor untuk menentukan berat volume tanah, kadar air tanah sesaat dan kelas tekstur. Kelerengan disetiap titik pengamatan diukur menggunakan klinometer, kedalaman tanah diamati menggunakan bor tanah. Bahaya erosi dan drainase diamati melalui pengamatan langsung di lapangan. Pengambilan sampel tanah untuk mengamati populasi jamur dan bakteri ditentukan dengan melihat hasil dari kelapa sawit yang dihasilkan (TBS, tinggi tanaman, diameter batang). Hubungan antara keragaan tanaman (tinggi tanaman, diameter batang, jumlah TBS dan berat TBS) dan pembatas fisik lahan (kadar air, lereng, berat volume) ditetapkan menggunakan analisis regresi dan kolerasi sederhana. Hasil penelitian menunjukkan bahwa kemiringan lereng dan berat volume tanah merupakan dua faktor pembatas fisik lahan yang memiliki hubungan sangat erat dengan semua variabel pertumbuhan dan hasil tanaman kelapa sawit, sedangkan kadar air tanah hanya memiliki hubungan yang erat dengan hasil tanaman kelapa sawit. (Program Studi Agroekoteknologi, Jurusan Budidaya Pertanian, Fakultas Pertanian, Universitas Bengkulu, 2014).
Rate of change of surface soil aggregation under different cropping and subsurface drainage regim... more Rate of change of surface soil aggregation under different cropping and subsurface drainage regimes was studied on a badly degraded lowland soil in the Lower Fraser Valley, British Columbia, Canada. The soil was the silty clay loam Humic Luvic Gleysol. Two cropping practices-continued spring-sown barley underseeded with clover for winter cover cropping and a 3 year grass ley-were established in a subsurface drained site and a poorly drained (no subsurface drainage) site. Grass ley consistently improved surface aggregate stability of drained and undrained soils when compared to cash-winter cover cropping integration. improved aggregate stability with grass was significantly correlated with increasing soil organic carbon content. Aggregate stability and its correlation with organic carbon varied with time of sampling, being lower in the early spring and higher in the fall. Seasonal variation in aggregate stability was attributed to soil water content at sampling.
In the Fraser River Delta of British Columbia, Canada, one in three farms faces soil problems ass... more In the Fraser River Delta of British Columbia, Canada, one in three farms faces soil problems associated with poor structure and low organic matter content. Surface soil structure usually degrades in early spring due to prolong wet conditions and a lack of surface cover during winter. Rates of change of surface soil aggregation under different overwinter cover crops followed by spring tillage operations were studied on a lowland soil in the Fraser River. Cover cropping treatments were bare control, winter-killed spring barley (Hordeurn vulgare L.) (cv. Virden), fall rye (Secale cereale L.) (cv. Danko) and annual ryegrass (Lo&m multiflorurn Lam.) (cv. Westerwolds). Aggregate stability, expressed as mean weight diameter (MWD) and the 2-6 mm aggregate-size fraction, decreased from fall to spring, then increased again over summer months. This seasonal variation in MWD was much more pronounced in the least stable bare soil than in the more stable cover cropped soils. In spring, overwinter cover crops had significantly higher MWD and the proportion of 2-6 mm water-stable aggregates up to 0.75 mm and 0.27 kg kg-i, respectively, when compared to bare control soil. Improved aggregate stability with cover crops was related to increasing organic carbon in the soil. After the plots were cultivated in spring, winter cropped soils had lower proportion of > 6 mm clods up to 0.28 kg kg-' than did soils left bare over winter. On the other hand, tilled plots had higher MWD and 2-6 mm aggregates for all cover cropping treatments due to lower aggregate water content at sampling, when compared to no-tilled plots. Overall, the greatest improvement in aggregate stability was observed under annual ryegrass, followed by fall rye and winter-killed spring barley. The results suggest that winter cover crops, such as annual ryegrass, may protect aggregate breakdown during winter and result in better structure after spring tillage operations when compared to the bare soil.
Faktor-faktor yang menentukan kesesuaian lahan untuk kelapa sawit terdiri dari faktor fisik (kete... more Faktor-faktor yang menentukan kesesuaian lahan untuk kelapa sawit terdiri dari faktor fisik (ketersediaan air, media perakaran, lereng bahaya erosi, bahaya banjir), faktor kimia (retensi hara, hara tersedia, toksisitas) dan kondisi biologis tanah. Penelitian ini bertujuan mendapatkan keeratan hubungan karakteristik fisik dan biologi tanah dengan pertumbuhan dan hasil kelapa sawit sebagai salah satu indikator produktivitas lahan. Sebanyak 50 tanaman menghasilkan dipilih sebagai sampel, kemiringan lahan diukur pada setiap tanaman. Variabel bebas yang diteliti adalah kemiringan lereng, kadar air tanah sesaat, kepadatan tanah, serta populasi jamur dan bakteri dalam tanah, sedangkan variabel tak bebas terdiri dari tinggi tanaman, diameter batang, jumlah TBS per batang dan berat tandan buah segar (TBS). Hasil penelitian menunjukkan lebih dari 60% keragaman pertumbuhan dan hasil kelapa sawit terkait dengan keragaman kemiringan lereng (R2 60-72%). Tampilan kelapa sawit meningkat dengan bert...
Indonesia is necessary to develop an increase in soil productivity. The decline in soil productiv... more Indonesia is necessary to develop an increase in soil productivity. The decline in soil productivity for agriculture can be caused by several factors, namely land conversion to a decrease in groundwater quantity. The actual pattern of providing irrigation water with the application of dielectric sensor technology is carried out in soil cultivation to create efficiency in providing irrigation water. This research was conducted using a single factor experimental method with repeated measurements on three types of land use, such as land without vegetation, soil with tomato cultivation, and soil with grass. Measurements were carried out using an automated application of soil moisture monitoring based on dielectric technology with two measuring periods. Each measuring period consists of two weeks or fourteen days. Soil sample analysis was carried out at the Bengkulu University soil laboratory. The results of the observations were analyzed using variance (ANOVA) on the 5% F test table, th...
Crop water use is usually determined by measuring the rate of evapotranspiration directly using t... more Crop water use is usually determined by measuring the rate of evapotranspiration directly using the lysimeter or indirectly by calculating several climate variables. This research aimed to develop a technique for predicting changes in soil water content by measuring an insitu soil dielectrical property and used them to calculate the use of water by palm oil nursery in the polybags. Coarse-textured (loamy sand) and medium-textured soils (sandy loam) were treated with six manure doses (equaled to 0, 2,4,6,8 and 10 ton.ha-1), with three replicates respectively, therefore there were 36 polybags used in this study. The soil electrical property was presented by the electrical impedance (Z) and measured using instrument designed to transfer the electrical current at 1 kHz in frequency through a couple of wire inserted into the soil. The Z values (in kΩ) were measured every day to evaluate daily changes in soil water content at the planting media of palm oil nursery. Rainfall and added irri...
Prosiding Seminar Nasional Fakultas Pertanian UNS, Aug 8, 2019
Kemiringan lahan merupakan salah satu faktor pembatas kesesuaian lahan untuk pertumbuhan dan hasi... more Kemiringan lahan merupakan salah satu faktor pembatas kesesuaian lahan untuk pertumbuhan dan hasil tanaman. Untuk tanaman kelapa sawit, kemiringan lahan 30 persen merupakan batas kritis kesesuaian lahan karena berdampak pada faktor-faktor pembatas langsung terhadap pertumbuhan seperti ketersediaan air dan unsur hara. Penelitian bertujuan mengevaluasi hubungan antara kemiringan lahan dengan kadar air tanah, pertumbuhan dan hasil kelapa sawit. Lokasi penelitian terletak di Desa Talang Tengah 1, Kabupaten Bengkulu Tengah, sekitar 10 km sebelah utara Kota Bengkulu, berada pada ketinggian 100 m dari permukaan laut. Delapan tanaman kelapa sawit umur 14 tahun masing-masing dipilih secara purposif dari lahan dengan kemiringan 0, 8, 10, 15, 20 dan 30 persen. Kadar air tanah pada kedalaman 0-10 cm, tinggi tanaman, lingkar batang, jumlah tandan buah segar (TBS) per tanaman serta bobot TBS perbuah diukur pada akhir musim hujan tahun 2018. Hasil penelitian menunjukkan bahwa kemiringan lahan memiliki hubungan yang erat dan negatif dengan kadar air tanah, jumlah dan bobot TBS, serta hubungan yang kurang erat dan positif dengan tinggi tanaman dan lingkar batang. Kelembapan tanah pada jarak 2 m atau lebih dari batang kelapa sawit cenderung lebih rendah dibandingkan pada jarak 1 m dari pokok kelapa sawit. Kelapa sawit yang ditanam pada lahan yang lebih miring cenderung mempercepat pertambahan tinggi dan ukuran batang tanaman namun mengurangi jumlah dan bobot TBS dibandingkan lahan yang lebih datar. Produktivitas pohon kelapa sawit dalam menghasilkan jumlah TBS menurun 0,3 buah per pohon dan rata-rata berat setiap TBS juga berkurang 0,12 kg untuk setiap kenaikan 1 persen kemiringan lahan. Kata kunci: kadar air tanah, kelapa sawit, kemiringan lahan, tandan buah segar Pendahuluan Kemampuan lahan dalam mendukung usaha budidaya pertanian bergantung pada karakteristik lahan tersebut, sementara unit lahan dengan karakteristik yang sama memiliki kesesuaian yang bisa berbeda apabila diusahakan untuk jenis tanaman berbeda. Diantara faktorfaktor pembatas kemampuan dan kesesuaian lahan, kemiringan lahan merupakan faktor pembatas fisik pertumbuhan tanaman yang bersifat permanen sehingga sangat sulit untuk dimodifikasi melalui tindakan pengelolaan tanah. Kemiringan lahan mempengaruhi tampilan tanaman melalui brought to you by CORE View metadata, citation and similar papers at core.ac.uk
Understanding the relation of agroecosystem types, ages, and soil properties are vital in maintai... more Understanding the relation of agroecosystem types, ages, and soil properties are vital in maintaining good quality soil. This study aims to explore the variation of selected soil properties with agroecosystem types and ages. The research has been conducted in North Bengkulu, Indonesia. Soil properties on agroecosystems of 5-yr, 10-yr, 15-yr oil palm plantation, 5-yr, 10-yr, 15-yr rubber plantation, food cropland, and scrubland were evaluated. The study found that soil in oil palm and rubber plantations of any age have a similar texture, bulk density (BD), and actual soil moisture (ASM). All plantation agroecosystems and scrubland have higher clay and lower silt content than that in food cropland. In addition, the scrubland has the highest ASM content among the agroecosystems. On the other hand, both agroecosystems enhances soil chemical properties than food cropland and scrubland as indicated by the improvement of organic-C, total-N, available P, exchangeable K and CEC of Ultisols. ...
Proceedings of the International Seminar on Promoting Local Resources for Sustainable Agriculture and Development (ISPLRSAD 2020), 2021
The conversion of forestland to cultivation land such as oil palm plantation has been reported to... more The conversion of forestland to cultivation land such as oil palm plantation has been reported to cause a shortage of water resources in Indonesia. However, it was not clearly understood whether the decrease in water resources was related to a specific crop type like oil palm following deforestation or to the disappearance of forest covers regardless of successive crop types. The present study aimed to analyse the temporal variations in soil water profiles under two crop plantations and to compare soil wetness between two crops. Two soil profiles were described at the adjacent mature oil palm and rubber plantations, fifteen cable sensors were inserted into the depths of 5-cm intervals up to the depth of 75 cm for the weekly determinations of the in-situ soil water. Undisturbed soil samples were then taken from corresponding layers at each plantation site for the soil bulk density and water retention analyses. Measurements of in-situ soil water and sampling for the water retention analyses were repeated at two other adjacent plantations of oil palm and rubber. Results showed that gravimetric and volumetric values of soil water content were consistently higher under oil palm compared to under rubber sites during the May-to-August measurements. The findings suggested that any deterioration of soil water resources after deforestation in the study area could be caused by the shift of land cover from forest to cultivated land rather than to a specific type of successive vegetation like oil palm.
Most of the water loss from the soil profile occurred through the evapotranspiration process espe... more Most of the water loss from the soil profile occurred through the evapotranspiration process especially when the plant covers were under maximum growth periods. This study aimed to apply a technique of measuring a dielectric variable for calculating soil water content and crop water use in the coarse and medium textured soils grown with upland rice. A couple of wires were inserted into the soil repacked in a 10-kg polybag grown with upland rice, the electrical impedance representing the dielectric value was measured using an instrument called the impedance meter. The impedance values were converted into the soil water content using a nonlinear regression model of ? = a.ebZ where a and b were constants. Results showed that the proposed technique of measuring the electrical impedance has successfully been applied to calculate the soil water content and the water use by upland rice grown in loamy sand and sandy loam soils. Cumulative water loss from loamy sand was about 4 L plant-...
Contamination of heavy metals on the soil leads to an increase in its acidity. Vermicompost appl... more Contamination of heavy metals on the soil leads to an increase in its acidity. Vermicompost application is commonly used to improve the properties of soil. The study was carried out to determine the reduction of the acidity in Pb and Cd contaminated soils under the application of vermicompost. Two laboratory experiments were set using Completely Randomized Design (CRD) with two factors. The first factor was soil samples, vis Inceptisols, and Entisols, and the second factor was the rates of vermicompost, consisted of 0, 5, 10, 15 g kg-1. The treatment combination was repeated three times. The soils were pretreated with 10 mg kg-1 Pb or Cd using Pb(NO3)2 and Cd(NO3)2. Three hundred kg soil sample was incorporated with vermicompost and placed in a 500 ml plastic bottle. The mixtures were incubated for eight weeks, and the moisture of the soil was maintained at field capacity. The acidity and soil temperature were monitored every week. The study indicated that Pb contaminated soil acid...
Naturalis: Jurnal Penelitian Pengelolaan Sumber Daya Alam dan Lingkungan
Penelitian ini bertujuan untuk (1) Mengetahui porsi daerah Imbuhan air tanah (Groundwater Recharg... more Penelitian ini bertujuan untuk (1) Mengetahui porsi daerah Imbuhan air tanah (Groundwater Recharge Area) di Kota Bengkulu dan Kabupaten Bengkulu Tengah dalam RTRW Kota Bengkulu dan Kabupaten Bengkulu Tengah. (2) Mengetahui kesesuaian penggunaan lahan Kota Bengkulu dan Kabupaten Bengkulu Tengah terhadap daerah Imbuhan air tanah (Groundwater Recharge Area). (3) Mengetahui kesesuaian daerah Imbuhan air tanah (Groundwater Recharge Area) dengan RTRW Kota Bengkulu dan Kabupaten Bengkulu Tengah. Penelitian ini dilaksanakan pada bulan Maret – April 2020 di Kota Bengkulu dan Kabupaten Bengkulu Tengah. Data yang digunakan dalam penelitian ini antara lain adalah data Demnas, Peta Geologi dan Citra Satelite Spot Perekaman Tahun 2016. Data Demnas di ektraksi melalui analisis spasial sehingga menghasilkan data, Linement Density, Drainage Density dan Slope Gradient, kemudian data Geologi diturunkan menjadi data Lithologi serta data Citra Satelite di ekstraksi menjadi data tutupan lahan. 5 paramet...
Abstract— This study aimed to determine relations between texture and organic carbon to the water... more Abstract— This study aimed to determine relations between texture and organic carbon to the water content measured using the field and laboratory methods for highland soils in Sumatera, Indonesia. Five locations covered with different annual crops were selected for the measurements of actual soil water content and the sample collections for the laboratory analyses. Soil water content was first determined in situ by measuring the electrical impedance Z (in kΩ) using a portable impedance meter and converting the data into soil water content θ (g.g-1) according to the following equation: θ = a.Zb where a = 0.45 and b = -0.15. A soil sample was then taken from the same point and soil depth of the dielectric measurement, put tightly in the plastic bag and brought to the laboratory for the analyses of field soil water content, texture, and carbon organic. The measurement and sampling were repeated at ten points for each location; therefore there were 50 pairs of data collected in this stu...
Abstract—Soil water content can be expressed as the ratio of water and dry soil on the volumetric... more Abstract—Soil water content can be expressed as the ratio of water and dry soil on the volumetric or mass (gravimetric) basis. The profile of soil water content refers to the volume of water held in the soil profile between field capacity and permanent wilting point in a defined depth of soil. This research aimed to compare temporal and vertical changes in soil water content profiles on the volumetric basis at four soils with different texture classes during a discharged period. The research was conducted in North Bengkulu Region during a discharged period of May-to-July 2019. Four soil profiles were described to determine characteristics of soil layers up to the depth of 100 cm. Disturbed and undisturbed soil samples were taken from 10 cm intervals; therefore there were 40 soil samples were used for the laboratory analyses of bulk density, texture and organic carbon content. Soil electrical impedance values (Z, in k) were measured every week at corresponding depths using a dielectr...
Jeruk gerga merupakan komoditas hortikultura lokal unggulan Kabupaten Lebong Provinsi Bengkulu ya... more Jeruk gerga merupakan komoditas hortikultura lokal unggulan Kabupaten Lebong Provinsi Bengkulu yang mempunyai keunggulan kompetitif yaitu buahnya berwarna kuning-orange, berbuah sepanjang tahun, berat buah mencapai 200-350 gram, kadar sari buah tinggi dan mempunyai permintaan pasar yang tinggi. Jeruk Gerga telah ditetapkan sebagai komoditas prioritas nasional untuk dikembangkan pada tahun 2011. Kualitas buah jeruk sangat dipengaruhi oleh beberapa faktor yaitu: varietas, lingkungan, pupuk, umur panen, waktu, dan suhu penyimpanan serta penanganan selanjutnya. Tujuan penelitian ini adalah untuk mengetahui hubungan antara sifat fisik dan kimia tanah pada zona perakaran dengan kualitas buah jeruk gerga. Penelitian ini dilaksanakan pada bulan Maret sampai Mei 2016 di Kecamatan Rimbo Pengadang Kabupaten Lebong. Varietas yang ditanam pada lahan tersebut adalah varietas gerga yaitu pada 3 lokasi kebun dengan umur yang berbeda ± 4,5 dan 3 tahun dengan 60 pohon dipilih sebagai sampel. Variabel...
Penggunaan pupuk sintetik dalam jangka panjang dapat merusak tanah dan menurunkan hasil tanaman s... more Penggunaan pupuk sintetik dalam jangka panjang dapat merusak tanah dan menurunkan hasil tanaman sehingga tanah tidak mampu lagi meningkatkan produktivitasnya. Hal ini menuntut kita untuk mencari teknologi alternatif yang mampu mengurangi penggunaan pupuk sintetik adalah dengan menggunakan bahan organik. Namun kebutuhan unsur hara yang di butuhkan oleh tanaman tidak semuanya dapat dipenuhi oleh pupuk organik sehingga penggunaannya perlu dikombinasikan dengan pupuk sintetik. Tujuan penelitian ini adalah untuk mendapatkan kombinasi dosis pupuk organik padat dan pupuk nitrogen terhadap sifat-sifat kimia tanah serta pertumbuhan dan hasil sawi. Penelitian ini dilaksanakan pada bulan Juni-September 2016 di rumah kaca dan Laboratorium Ilmu Tanah Universitas Bengkulu. Tanah yang digunakan adalah Ultisol yang berasal dari daerah Kandang Limun Kecamatan Muara Bangkahulu. Pada penelitian ini digunakan benih sawi (panah merah) yang ditanam pada polibag yang disusun berdasarkan Rancangan Acak Len...
The objective of the study were to know the present existence of flowering condition of Rafflesia... more The objective of the study were to know the present existence of flowering condition of Rafflesia arnoldii R. Br. habitat in Bengkulu, Indonesia. The study was conducted in 1998 within 3 District in Bengkulu. The method of the study was a survey. Primary data was collected by the questionare to the peoples who live in the surrounding of habitat, however, the secondary data was collected through government office and study literature. As the results, the distribution of rafflesia habitats observed during the study in Bengkulu were divided into eight locations, three habitats locatated in lowland, and five habitats located in highland area. To protect and preserve the habitats, sign board, fenching, and reintroduction of the host vine of Liana plant are important. The population growth, education and ethnic background of the local community have induced destruction of raflesia habitats. Intensity of information delivery from the local government contribute to the willingness of protecting rafflesia flower. The establishment of infrastructure (roads and electricity) is desired for the use of rafflesia flowers as a tourist attraction.
Sektor pertanian mampu memberikan sumbangan besar bagi perekonomian Indonesia. Salah satu subsekt... more Sektor pertanian mampu memberikan sumbangan besar bagi perekonomian Indonesia. Salah satu subsektor penting dari sektor pertanian adalah perkebunan yang cakupan usahanya mencapai lebih dari seratus komoditas.Beberapa jenis komoditas perkebunan mampu memberikan kontribusi besar bagi perekonomian negara seperti karet, kopi, kakao dan kelapa sawit. Kelapa sawitmerupakan salah satu komoditas yang perkembangannya paling pesat,sehingga prospek usaha kelapa sawit sangat baik untuk dikembangkan. Penelitian ini bertujuan untuk mengevaluasi keeratan hubungan antara keragaan tanaman kelapa sawit menghasilkan dengan beberapa faktor pembatas kesesuaian lahan. Penelitian inidilaksanakan di Desa Talang Tengah, Kecamatan Pondok Kubang, Kabupaten Bengkulu Tengah, Provinsi Bengkulu.Lima Puluh tanaman dengan berbagai keragaan vegetatif dan generatif dipilih sebagai sampel. Pada jarak 2 meter dari setiap sampel tanaman kelapa sawit, contoh tanah utuh dan terganggu diambil dari kedalaman 0-20 cm masing-masing menggunakan ring sampel dan bor untuk menentukan berat volume tanah, kadar air tanah sesaat dan kelas tekstur. Kelerengan disetiap titik pengamatan diukur menggunakan klinometer, kedalaman tanah diamati menggunakan bor tanah. Bahaya erosi dan drainase diamati melalui pengamatan langsung di lapangan. Pengambilan sampel tanah untuk mengamati populasi jamur dan bakteri ditentukan dengan melihat hasil dari kelapa sawit yang dihasilkan (TBS, tinggi tanaman, diameter batang). Hubungan antara keragaan tanaman (tinggi tanaman, diameter batang, jumlah TBS dan berat TBS) dan pembatas fisik lahan (kadar air, lereng, berat volume) ditetapkan menggunakan analisis regresi dan kolerasi sederhana. Hasil penelitian menunjukkan bahwa kemiringan lereng dan berat volume tanah merupakan dua faktor pembatas fisik lahan yang memiliki hubungan sangat erat dengan semua variabel pertumbuhan dan hasil tanaman kelapa sawit, sedangkan kadar air tanah hanya memiliki hubungan yang erat dengan hasil tanaman kelapa sawit. (Program Studi Agroekoteknologi, Jurusan Budidaya Pertanian, Fakultas Pertanian, Universitas Bengkulu, 2014).
Rate of change of surface soil aggregation under different cropping and subsurface drainage regim... more Rate of change of surface soil aggregation under different cropping and subsurface drainage regimes was studied on a badly degraded lowland soil in the Lower Fraser Valley, British Columbia, Canada. The soil was the silty clay loam Humic Luvic Gleysol. Two cropping practices-continued spring-sown barley underseeded with clover for winter cover cropping and a 3 year grass ley-were established in a subsurface drained site and a poorly drained (no subsurface drainage) site. Grass ley consistently improved surface aggregate stability of drained and undrained soils when compared to cash-winter cover cropping integration. improved aggregate stability with grass was significantly correlated with increasing soil organic carbon content. Aggregate stability and its correlation with organic carbon varied with time of sampling, being lower in the early spring and higher in the fall. Seasonal variation in aggregate stability was attributed to soil water content at sampling.
In the Fraser River Delta of British Columbia, Canada, one in three farms faces soil problems ass... more In the Fraser River Delta of British Columbia, Canada, one in three farms faces soil problems associated with poor structure and low organic matter content. Surface soil structure usually degrades in early spring due to prolong wet conditions and a lack of surface cover during winter. Rates of change of surface soil aggregation under different overwinter cover crops followed by spring tillage operations were studied on a lowland soil in the Fraser River. Cover cropping treatments were bare control, winter-killed spring barley (Hordeurn vulgare L.) (cv. Virden), fall rye (Secale cereale L.) (cv. Danko) and annual ryegrass (Lo&m multiflorurn Lam.) (cv. Westerwolds). Aggregate stability, expressed as mean weight diameter (MWD) and the 2-6 mm aggregate-size fraction, decreased from fall to spring, then increased again over summer months. This seasonal variation in MWD was much more pronounced in the least stable bare soil than in the more stable cover cropped soils. In spring, overwinter cover crops had significantly higher MWD and the proportion of 2-6 mm water-stable aggregates up to 0.75 mm and 0.27 kg kg-i, respectively, when compared to bare control soil. Improved aggregate stability with cover crops was related to increasing organic carbon in the soil. After the plots were cultivated in spring, winter cropped soils had lower proportion of > 6 mm clods up to 0.28 kg kg-' than did soils left bare over winter. On the other hand, tilled plots had higher MWD and 2-6 mm aggregates for all cover cropping treatments due to lower aggregate water content at sampling, when compared to no-tilled plots. Overall, the greatest improvement in aggregate stability was observed under annual ryegrass, followed by fall rye and winter-killed spring barley. The results suggest that winter cover crops, such as annual ryegrass, may protect aggregate breakdown during winter and result in better structure after spring tillage operations when compared to the bare soil.
Faktor-faktor yang menentukan kesesuaian lahan untuk kelapa sawit terdiri dari faktor fisik (kete... more Faktor-faktor yang menentukan kesesuaian lahan untuk kelapa sawit terdiri dari faktor fisik (ketersediaan air, media perakaran, lereng bahaya erosi, bahaya banjir), faktor kimia (retensi hara, hara tersedia, toksisitas) dan kondisi biologis tanah. Penelitian ini bertujuan mendapatkan keeratan hubungan karakteristik fisik dan biologi tanah dengan pertumbuhan dan hasil kelapa sawit sebagai salah satu indikator produktivitas lahan. Sebanyak 50 tanaman menghasilkan dipilih sebagai sampel, kemiringan lahan diukur pada setiap tanaman. Variabel bebas yang diteliti adalah kemiringan lereng, kadar air tanah sesaat, kepadatan tanah, serta populasi jamur dan bakteri dalam tanah, sedangkan variabel tak bebas terdiri dari tinggi tanaman, diameter batang, jumlah TBS per batang dan berat tandan buah segar (TBS). Hasil penelitian menunjukkan lebih dari 60% keragaman pertumbuhan dan hasil kelapa sawit terkait dengan keragaman kemiringan lereng (R2 60-72%). Tampilan kelapa sawit meningkat dengan bert...
Indonesia is necessary to develop an increase in soil productivity. The decline in soil productiv... more Indonesia is necessary to develop an increase in soil productivity. The decline in soil productivity for agriculture can be caused by several factors, namely land conversion to a decrease in groundwater quantity. The actual pattern of providing irrigation water with the application of dielectric sensor technology is carried out in soil cultivation to create efficiency in providing irrigation water. This research was conducted using a single factor experimental method with repeated measurements on three types of land use, such as land without vegetation, soil with tomato cultivation, and soil with grass. Measurements were carried out using an automated application of soil moisture monitoring based on dielectric technology with two measuring periods. Each measuring period consists of two weeks or fourteen days. Soil sample analysis was carried out at the Bengkulu University soil laboratory. The results of the observations were analyzed using variance (ANOVA) on the 5% F test table, th...
Crop water use is usually determined by measuring the rate of evapotranspiration directly using t... more Crop water use is usually determined by measuring the rate of evapotranspiration directly using the lysimeter or indirectly by calculating several climate variables. This research aimed to develop a technique for predicting changes in soil water content by measuring an insitu soil dielectrical property and used them to calculate the use of water by palm oil nursery in the polybags. Coarse-textured (loamy sand) and medium-textured soils (sandy loam) were treated with six manure doses (equaled to 0, 2,4,6,8 and 10 ton.ha-1), with three replicates respectively, therefore there were 36 polybags used in this study. The soil electrical property was presented by the electrical impedance (Z) and measured using instrument designed to transfer the electrical current at 1 kHz in frequency through a couple of wire inserted into the soil. The Z values (in kΩ) were measured every day to evaluate daily changes in soil water content at the planting media of palm oil nursery. Rainfall and added irri...
Prosiding Seminar Nasional Fakultas Pertanian UNS, Aug 8, 2019
Kemiringan lahan merupakan salah satu faktor pembatas kesesuaian lahan untuk pertumbuhan dan hasi... more Kemiringan lahan merupakan salah satu faktor pembatas kesesuaian lahan untuk pertumbuhan dan hasil tanaman. Untuk tanaman kelapa sawit, kemiringan lahan 30 persen merupakan batas kritis kesesuaian lahan karena berdampak pada faktor-faktor pembatas langsung terhadap pertumbuhan seperti ketersediaan air dan unsur hara. Penelitian bertujuan mengevaluasi hubungan antara kemiringan lahan dengan kadar air tanah, pertumbuhan dan hasil kelapa sawit. Lokasi penelitian terletak di Desa Talang Tengah 1, Kabupaten Bengkulu Tengah, sekitar 10 km sebelah utara Kota Bengkulu, berada pada ketinggian 100 m dari permukaan laut. Delapan tanaman kelapa sawit umur 14 tahun masing-masing dipilih secara purposif dari lahan dengan kemiringan 0, 8, 10, 15, 20 dan 30 persen. Kadar air tanah pada kedalaman 0-10 cm, tinggi tanaman, lingkar batang, jumlah tandan buah segar (TBS) per tanaman serta bobot TBS perbuah diukur pada akhir musim hujan tahun 2018. Hasil penelitian menunjukkan bahwa kemiringan lahan memiliki hubungan yang erat dan negatif dengan kadar air tanah, jumlah dan bobot TBS, serta hubungan yang kurang erat dan positif dengan tinggi tanaman dan lingkar batang. Kelembapan tanah pada jarak 2 m atau lebih dari batang kelapa sawit cenderung lebih rendah dibandingkan pada jarak 1 m dari pokok kelapa sawit. Kelapa sawit yang ditanam pada lahan yang lebih miring cenderung mempercepat pertambahan tinggi dan ukuran batang tanaman namun mengurangi jumlah dan bobot TBS dibandingkan lahan yang lebih datar. Produktivitas pohon kelapa sawit dalam menghasilkan jumlah TBS menurun 0,3 buah per pohon dan rata-rata berat setiap TBS juga berkurang 0,12 kg untuk setiap kenaikan 1 persen kemiringan lahan. Kata kunci: kadar air tanah, kelapa sawit, kemiringan lahan, tandan buah segar Pendahuluan Kemampuan lahan dalam mendukung usaha budidaya pertanian bergantung pada karakteristik lahan tersebut, sementara unit lahan dengan karakteristik yang sama memiliki kesesuaian yang bisa berbeda apabila diusahakan untuk jenis tanaman berbeda. Diantara faktorfaktor pembatas kemampuan dan kesesuaian lahan, kemiringan lahan merupakan faktor pembatas fisik pertumbuhan tanaman yang bersifat permanen sehingga sangat sulit untuk dimodifikasi melalui tindakan pengelolaan tanah. Kemiringan lahan mempengaruhi tampilan tanaman melalui brought to you by CORE View metadata, citation and similar papers at core.ac.uk
Understanding the relation of agroecosystem types, ages, and soil properties are vital in maintai... more Understanding the relation of agroecosystem types, ages, and soil properties are vital in maintaining good quality soil. This study aims to explore the variation of selected soil properties with agroecosystem types and ages. The research has been conducted in North Bengkulu, Indonesia. Soil properties on agroecosystems of 5-yr, 10-yr, 15-yr oil palm plantation, 5-yr, 10-yr, 15-yr rubber plantation, food cropland, and scrubland were evaluated. The study found that soil in oil palm and rubber plantations of any age have a similar texture, bulk density (BD), and actual soil moisture (ASM). All plantation agroecosystems and scrubland have higher clay and lower silt content than that in food cropland. In addition, the scrubland has the highest ASM content among the agroecosystems. On the other hand, both agroecosystems enhances soil chemical properties than food cropland and scrubland as indicated by the improvement of organic-C, total-N, available P, exchangeable K and CEC of Ultisols. ...
Proceedings of the International Seminar on Promoting Local Resources for Sustainable Agriculture and Development (ISPLRSAD 2020), 2021
The conversion of forestland to cultivation land such as oil palm plantation has been reported to... more The conversion of forestland to cultivation land such as oil palm plantation has been reported to cause a shortage of water resources in Indonesia. However, it was not clearly understood whether the decrease in water resources was related to a specific crop type like oil palm following deforestation or to the disappearance of forest covers regardless of successive crop types. The present study aimed to analyse the temporal variations in soil water profiles under two crop plantations and to compare soil wetness between two crops. Two soil profiles were described at the adjacent mature oil palm and rubber plantations, fifteen cable sensors were inserted into the depths of 5-cm intervals up to the depth of 75 cm for the weekly determinations of the in-situ soil water. Undisturbed soil samples were then taken from corresponding layers at each plantation site for the soil bulk density and water retention analyses. Measurements of in-situ soil water and sampling for the water retention analyses were repeated at two other adjacent plantations of oil palm and rubber. Results showed that gravimetric and volumetric values of soil water content were consistently higher under oil palm compared to under rubber sites during the May-to-August measurements. The findings suggested that any deterioration of soil water resources after deforestation in the study area could be caused by the shift of land cover from forest to cultivated land rather than to a specific type of successive vegetation like oil palm.
Most of the water loss from the soil profile occurred through the evapotranspiration process espe... more Most of the water loss from the soil profile occurred through the evapotranspiration process especially when the plant covers were under maximum growth periods. This study aimed to apply a technique of measuring a dielectric variable for calculating soil water content and crop water use in the coarse and medium textured soils grown with upland rice. A couple of wires were inserted into the soil repacked in a 10-kg polybag grown with upland rice, the electrical impedance representing the dielectric value was measured using an instrument called the impedance meter. The impedance values were converted into the soil water content using a nonlinear regression model of ? = a.ebZ where a and b were constants. Results showed that the proposed technique of measuring the electrical impedance has successfully been applied to calculate the soil water content and the water use by upland rice grown in loamy sand and sandy loam soils. Cumulative water loss from loamy sand was about 4 L plant-...
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