Papers by Renata Castoldi
Horticultura Brasileira, Mar 31, 2014
T he cucumber (Cucumis sativus) has great economic and social importance among the vegetables gro... more T he cucumber (Cucumis sativus) has great economic and social importance among the vegetables grown by Brazilian agribusiness. Cucumbers are greatly desired and consumed in all regions. Furthermore, they can be used in cosmetics and medicines because of their nutraceutical properties . Data from Embrapa (2010) show that the annual Brazilian cucumber output exceeds 200,000 tons. The southeastern region accounts for over 50% of total Brazilian cucumber production . A considerable number of cucumber farmers cultivate their products in soil, covered areas or in greenhouses. However, there have been significant advances in the amount of productive units grown in containers of various substrates, which require practical considerations relating to biocide expenses, improved product quality, the standard of plants produced and the result of these changes in the marketing of the final product . However, the intensive use of land in a protected environment has caused salinization and pathogen problems. Thus, preventative measures to avoid degradation have been used in the cultivation substrates. These culture systems promote increases in productivity and fruit quality, greater density, and reductions in the use of pesticides, enabling the production of healthier fruits . The development of cultivation
Smart agricultural technology, Aug 1, 2023
Acta horticulturae, Sep 1, 2007
The aim of the study was to evaluate production and determine the level of total soluble solids f... more The aim of the study was to evaluate production and determine the level of total soluble solids for cherry tomatoes, under protected cultivation carried out with different types of spacing and pruning. The experiment was performed according to a randomized block design in a 2x2 factorial scheme, with two types of spacing between plants and two types of pruning, and with five repetitions. The cultivar 'Sindy' (De Ruiter) was utilized. Each experimental parcel contained seven plants, and fruits were collected from the five central plants. The seedlings were produced in Styrofoam trays of 128 cells and transplanted at 33 days after planting using two types of spacing between plants (0.3 and 0.5 m) and 1 m spacing between rows. The plants were grown as single-or double-stem form and staked individually. The parameters evaluated were the number of fruit per plant, fresh weight of fruit and the level of total soluble solids expressed in °Brix. There was no evidence of significant interaction between the treatments. For fresh weight of fruit per plant, there was a significant effect when the plants were grown with a spacing of 1 x 0.5 m, with 4.12 kg per plant, compared to a production of 3.00 kg per plant with a spacing of 1 x 0.3 m. With regard to the number of fruit per plant, a significant difference was seen between the two types of spacing, where a spacing of 1 x 0.3 m yielded a lower number of fruit per plant (188.8), compared to that observed with a spacing of 1 x 0.5 m (238.1). With regard to the two types of pruning, there was a significant effect for only the number of fruit per plant, where the mean number of fruit was 188.4 with one stem and 238.4 with two stems. No significant difference was observed between the treatments for the level of total soluble solids. It is concluded that for the cultivar 'Sindy', under protected cultivation, production is better with a spacing of 0.5 m between plants and the use of two stems per plant.
Acta horticulturae, Sep 1, 2007
Revista Brasileira de Ciências Agrárias (Agrária), Oct 27, 2020
In underdeveloped countries, zinc deficiency is a public health problem. The main foods consumed ... more In underdeveloped countries, zinc deficiency is a public health problem. The main foods consumed in these countries have low levels of the nutrient, making their consumption insufficient to meet the minimum daily requirements. Therefore, the aim of this study was to evaluate agronomic biofortification with zinc in curly lettuce cultivars. The experiment was carried out at the Universidade Federal de Uberlândia -Monte Carmelo Campus, using a complete randomized block design in a 4 × 5 factorial scheme with four replications. The factors consisted of four curly lettuce cultivars (Brida, Isabela, Thaís, and Vanda) and five doses of leaf zinc (0, 400, 800, 1200 and 1600 g ha -1 of Zn). The following traits were evaluated: zinc leaf content, plant height, SPAD index, total fresh mass, stem diameter, head diameter, number of leaves per plant, and estimated average yield. Data were subjected to analysis of variance by the F test (α = 0.05) and means were compared by Tukey test at 5% probability and regression analyzes. According to the results obtained, the cultivar Thaís can be considered the lettuce with highest leaf zinc content and the most biofortified. It is advisable to use 700 g ha -1 of leaf zinc to obtain biofortified lettuce with increased yield.
한국원예학회 기타간행물, Aug 1, 2006
The aim of the study was to determine the percentage of crude protein, crude fiber and crude fat ... more The aim of the study was to determine the percentage of crude protein, crude fiber and crude fat (ether extract) of 25 genotypes of kale from the Germplasm Bank of Instituto Agronômico de Campinas and of one genotype grown in the region of Jaboticabal-SP. The plants were cultivated in the field, and the leaves after collection were pre-dried in a convection oven at 65°C for 72 h. Afterward, the leaves were analyzed for crude protein, crude fiber and crude fat (ether-soluble materials). Significant differences were detected among the different genotypes for all the characteristics examined. Of the genotypes studied, six showed more than 30% crude protein: HS-20 (32.56%), Comum (31.70%), Couve de Arthur Nogueira 2 (31.16%), Pires 2 de Campinas (30.63%), Manteiga I-916 (30.36%), and Manteiga de Ribeirão Pires I-2446 (30.03%). In relation to crude fiber, the highest percentage was seen in the genotype Manteiga de Mococa (10.92%), differing significantly from the other genotypes studied. With regard to crude fat, the highest percentage was found in the genotype HS-20 (3.72%), and Pires 1 de Campinas (3.34%). Of the genotypes tested, HS-20 stood out among the others, showing both the highest percentage of protein and fat.
Ciência e Agrotecnologia, 2024
Seaweed extract-based fertilizers are applied to mitigate the effects of stress on plants. In thi... more Seaweed extract-based fertilizers are applied to mitigate the effects of stress on plants. In this study, we evaluated the effects of different concentrations of seaweed extract-based fertilizer and different irrigation depths on potato crops. The Ágata cultivar and the Markies cultivar were used to conduct two experiments simultaneously. A 4 × 4 experimental design was used, with four doses of seaweed extract-based fertilizer (0, 0.5, 1.0, and 4.0 L ha-1) and four irrigation depths (50%, 75%, 100%, and 125% of crop evapotranspiration); each treatment had three replicates. Leaves were collected 67 days after emergence to analyze macronutrients and micronutrients; additionally, the number of stems per plant and physiological variables were assessed. After harvesting, the number and weight of tubers in different classes were recorded. The differences in parameters among treatment groups were determined by analysis of variance using the F-test, and regression analysis was performed when a significant difference was recorded. The results showed that the contents of potassium, phosphorus, magnesium, and calcium in the leaves of the Ágata cultivar were below the optimal levels for the crop, irrespective of the irrigation level and the dose of seaweed extract-based fertilizer applied. The highest irrigation depths at 100% and 125% of crop evapotranspiration were associated with an increase in the number and weight of the large tubers of the Ágata and Markies cultivars.
Acta Scientiarum-agronomy, Sep 20, 2022
Brazilian consumers are increasingly seeking unique vegetable products, such as mini lettuces. Ho... more Brazilian consumers are increasingly seeking unique vegetable products, such as mini lettuces. However, their production is hampered by a wide variety of pathogens, including Pectobacterium carotovorum subsp. carotovorum, which causes soft rot in lettuce. In this study, we aimed to select biofortified mini lettuce genotypes with good agronomic traits and resistance to P. carotovorum. A randomized block design consisting of 12 treatments, conducted in a field and greenhouse (Federal University of Uberlândia [UFU]), was used to select biofortified mini lettuce with good agronomic traits: SPAD index, stem and plant diameter, stem length, plant height, number of leaves, fresh weight, and bolt resistance. A completely randomized design consisting of 13 treatments was used for resistance or susceptibility testing. The bacterial suspension was inoculated and the following were assessed: disease severity, 16 days after inoculation; area under the disease progress curve, calculated separately at 4, 8, 12, and 16 days after inoculation as well as the sum of data calculated on all the assessment days; and the disease resistance class. The genotypes UFU 215#1 and UFU 215#2 had significantly high carotenoid concentrations. The genotypes UFU 66#4, UFU 215#1, and UFU 215#7 showed high bolt resistance. All genotypes were classified as resistant or moderately resistant to the P. carotovorum isolate, UFU A7.
Acta horticulturae, Jul 1, 2007
Journal of Plant Nutrition, Apr 21, 2022
Acta horticulturae, Feb 1, 2012
The objective of this study was to evaluate the chemical alterations of the substrate in the cult... more The objective of this study was to evaluate the chemical alterations of the substrate in the cultivation of peppers grown in coconut husk fiber, in a protected environment. Initially, 160 pepper plants ('Eppo') were divided into four blocks, where two pots per block were analyzed every 21 days after transplanting. The cultivation of pepper was carried out in plastic pots of 13 L, containing coconut husk fiber, and placed in double rows with a spacing of 0.5×0.8 m between single rows and 1.10 m between double rows. After removal of the plants from the pots, individual samples of substrate (approximately 1 L) were collected from each pot and dried at ambient temperature. The levels of Ca, Mg, S, Cl, Na, B, Fe, Mn, Cu and Zn were determined for all periods of the cultivation. These analyses were performed using the method of extraction 1:1.5 v/v. There was an increase in the levels of all the nutrients evaluated. Further studies should be conducted to develop a better nutrient solution.
Revista Caatinga, Oct 1, 2022
The experimental design was completely randomized and subdivided into plots that were evaluated o... more The experimental design was completely randomized and subdivided into plots that were evaluated over time. In the plots, 12 genotypes of lettuce were used, and the subplots were monitored over time (7 th to the 18 th day after inoculation). For each virulence phenotypes of Bremia lactucae, a separate experiment was performed with three replicates. To select resistant genotypes, plants were inoculated with distilled water, sporangia removed from infected tissues and Tween 20. The genotypes were evaluated when sporulation appeared on cotyledonary leaves of the susceptible cultivar Solaris, verifying the proportion of necrotic and sporulated plants. There was a correlation between genotypes and times for all virulence phenotypes evaluated.
Horticultura Brasileira, Mar 31, 2014
Lettuce is the most consumed leafy vegetable in Brazil. Its production, nonetheless, is increasin... more Lettuce is the most consumed leafy vegetable in Brazil. Its production, nonetheless, is increasing in difficulties mainly due to the infestation of producing areas with Bremia lactucae. Thus, the use of horizontal resistant cultivars is the most viable alternative in controlling progress of disease. So, the objective of this study was to obtain resistant lettuce progenies to the races of downy mildew:
한국원예학회 기타간행물, Aug 1, 2006
한국원예학회 기타간행물, Aug 1, 2006
Acta horticulturae, Aug 1, 2012
Endive (Cichorium intybus) is one of the vegetables least studied in Brazil with respect to the b... more Endive (Cichorium intybus) is one of the vegetables least studied in Brazil with respect to the behavior of the most commercialized cultivars, but it is known that the number of plants per area is one of the factors that most influences the productivity of various crops. Thus, the objective of this work was to evaluate the behavior of endive using four spacings between rows and five spacings between plants, in the region of Jaboticabal-SP. The experiment was conducted in the field in the period of August 12, 2008 to November 6, 2008, in the experimental area of the Sector of Vegetable Crops and Aromatic-Medicinal Plants, Department of Crop Sciences, School of Agricultural and Veterinary Sciences-UNESP-FCAV. The experimental design utilized was a randomized block design with a 4 x 5 factorial scheme, i.e., four spacings between rows (0.15, 0.20, 0.25 and 0.30 m) and five spacings between plants (0.10, 0.15, 0.20, 0.25 and 0.30 m), with three repetitions. The endive cultivar studied was 'Pão-de-Acucar', obtained from the company Tecnoseed. Seedlings were established utilizing the sowing system in 200-cell Styrofoam trays containing the substrate Plantmax Vegetables ® HA. The seedlings were transplanted at 37 days after planting. After harvesting, the following characteristics were determined: height (cm), diameter of the plant in rows (cm), diameter of the plant in between rows (cm), number of leaves, fresh weight (g) and total estimated productivity (t/ha). There were no interactions between the factors studied. Based on the data, we conclude that spacings of 0.15 m between rows and of 0.15 m between plants produce plants of higher quality and with greater productivity.
Agronomy, Apr 27, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Comunicata Scientiae, Oct 7, 2022
Although cabbage is one of the most important vegetables in Brazil, seedling production is carrie... more Although cabbage is one of the most important vegetables in Brazil, seedling production is carried out empirically by producers, given that there are no literature reports on the optimal start time and management strategy for seedling fertigation. The present study aimed to assess the influence of fertigation management on the development of cabbage seedlings, in order to determine the best start time and application intervals for nutrient supply. The study consisted of two experiments conducted in a randomized block design, with six repetitions each. The first involved six fertigation start times (0, 3, 6, 9, 12 and 15 days after emergence) and the second consisted of five treatments, that is, five fertigation application frequencies (every 3, 4, 5, 6 and 7 days after the first application). Biometric, physiological and nutrient characteristics were assessed when the seedlings reached the ideal (commercial) transplanting stage. Fertigation start times had a significant effect on the number of leaves, shoot and root dry weight, leaf area and macronutrient accumulation. The best results were obtained for a start time of 0 to 6 days after emergence (DAE). Application intervals had a significant effect only on calcium and sulfur accumulation. It was concluded that cabbage seedling fertigation should start three days after emergence, adopting a four-day application interval.
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Papers by Renata Castoldi