اثر تنش سرمازدگی بر رشد گیاهان پاییزه و راهکارهاي مقابله

مجله پژوهشهای گیاهی #R##N#(مجله زیست شناسی ایران)(علمی), 2016

2014

In order to identification of allelopathic compounds and investigation of the effect of aerial part extract of orchard grass on germination and seedling growth of alfalfa an experiment conducted as completely randomized design with four replications at University of Mohaghegh Ardabili, Iran. Treatments were concentrations of orchard grass extracts including 0, 25, 50, 75, and 100%. Radicle and plumule length, fresh weight of seedling, percentage and rate of germination were measured. Results showed that with increasing extract concentration there was a reduction trend in all studied traits (except of seedling fresh weight and plumule length which increased at lower concentrations and then declined). The highest content of allelopathic substances related to phenolic compounds (7.98 and 13.91 mg in root and shoot, respectively). Plumule length and seedling fresh weight increased at the concentrations between 23 to 26% and after then reduced sharply and prevented completely at 100% con...

sid.ir

In order to obtain an optimum management of natural resources, determination of variables that control plant presence and distribution is needed. In the present research, the relationship between some character plants of drylands and some soil and environmental variables were investigated. After primary survey and selection of main plant species, sampling was done in each vegetation type within 3-4 transects (200 m length) by randomized-systematic method. Dominant species included Tamarix ramosissima, Salsola kali, Phragmites australis and Ephedra distachya. Vegetation sampling was done in 200 plots and soil sampling was done from two depth 0-20 and 20-60 cm in 38 plots. SHAZAM 10 package was used to find the logical relationship between plant species and environmental variables. The statistical pattern for this research was based on qualitative function. Therefore, logic function was

مواد و فناوری های پیشرفته, 2009

In this paper, synthesis of HAp particles with Dandelion-like morphology, a unique morphology rarely reported previously has been studied via a micelle-directed hydrothermal method. The phase composition, morphology and particle size of synthesized powder were investigated using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) techniques and Scanning electron microscopy (SEM). Results revealed that cationic surfactant cetyltrimethylammonium bromide (CTAB) and non-ionic co-surfactant polyethylene glycol 600 (PEG 600) can act as template and co-template, respectively for synthesis of dandelion-like HAp. SEM observations showed HAp crystals have a uniform dandelion-like morphology with an average diameter of about 100-150 nm and aspect ratio of about 20 for each tooth. Fourier transform infrared spectroscopy study revealed that a certain level of carbonate substitution has taken place in the product. The template action of CTAB and co-template action of PEG 600 used to regulate the nucleation and crystal growth are discussed.

Journal of Science and Technology of Greenhouse Culture, 2015

2015

In order to study the effect of foliar application of zinc and iron on yield quantity and quality of canola (Brassica napus cv. Talaye), an experiment was conducted in Zarghan region of Fars in 2008-2009 crop season..Treatments including concentration of zinc sulfate in three levels: (0, 2, 4 gr lit -1 ) Iron sulfate in three levels: (0, 2, 4 gr lit -1 ). This experiment was arranged as factorial using randomized complete block design (RCB) in four replications. Iron and zinc solutions were sprayed twice (at first in stem elongation and then second in early flowering). Significant interaction between zinc and iron foliar application was observed for grain yield, seed protein percentage and oil yield. Maximum grain yield (4905.3 kg ha -1 ), seed protein percentage (37.7%) and oil yield (2124.5 kg ha -1 ) was obtained from foliar application of combined zinc and iron at 4 g lit -1 . Increasing of zinc from 0 to 4 gr lit -1 significantly increased 1000 seed weight (from 4.24 to 4.69 gr), number of seed per pod (from 19.12 to 22.88), seed oil percentage (from 38.67 to 43.17) and seed zinc concentration (from 33.28 to 22.07 mg kg -1 ). Increasing iron from 0 to 4 gr lit -1 significantly increased 1000 seed weight (from 4.24 to 4.64 gr) and seed iron concentration (from 64.29 to 79.18 mg kg -1 ). Ultimately, based on our results, the treatment of twice foliar of zinc and iron sulfate and at 4 g lit -1 was suggested to get more quantity and quality of canola (Talaye) in Zarghan.

Al-Mağallaẗ al-ʿarabiyyaẗ li-l-ʿulūm al-tarbawiyaẗ wa al-nafsiyaẗ, 2023

The current study aimed to identify the relationship between the family climate and emotional balance in a sample of high school students under the Corona pandemic. It also aimed to detect the level of family climate and emotional balance in the study sample. The researcher used the descriptive curriculum in both the link and the comparative aspects, and the research sample consisted of (109) high school students in Saudi schools. The study used demographic information resolution. In order to answer the study's questions, it was used: the family climate scale and the emotional balance scale. Through the study's findings, it was found that there was a positive statistically significant correlation between the family climate and emotional balance. The results showed no statistically significant ، ‫والهفشية‬ ‫الرتبوية‬ ‫للعلوم‬ ‫العربية‬ ‫اجمللة‬ 3 differences between the two groups (males and females) in the family climate level, and the emotional balance of a sample of high school students. The study also showed that there were no statistically significant differences between the two groups (scientific, literary) in the level of family climate, and emotional balance in a sample of high school students.

بحوث, 2021

2015