Mahdi Kaykhazaleh; Mahmood Ramroudi; Mohammad Galavi; َAhmad Ghanbari; Hamid Reza Fanay
Abstract
An experiment has been conducted in the form of split plots in a randomized complete block design with three replications at the Agricultural and Natural Resources Research Institute in Zahak to evaluate the effect of drought stress and potassium application on yield and morphophysiological traits of ...
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An experiment has been conducted in the form of split plots in a randomized complete block design with three replications at the Agricultural and Natural Resources Research Institute in Zahak to evaluate the effect of drought stress and potassium application on yield and morphophysiological traits of safflower (Goldasht cultivar) under saline irrigation conditions (EC 6 dS.m-1) in 2018-2019. Drought stress irrigation regimes have been tested at three levels (irrigation after 45% (control), 65%, and 85% of admissible moisture depletion) as the main factor, and potassium fertilizer at four levels (0, 75, 150, and 225 kg.ha-1) as the sub factor. According to the findings, drought stress has reduced plant height, number of heads per plant, number of seeds per head, seed and biological yield, and relative water content. The use of potassium, on the other hand, has increased the above traits greatly. Irrigation after 45% moisture depletion increases seed yield by 42.32%, compared to irrigation after 85% moisture depletion. Interaction of drought stress and potassium has had a significant effect on number of branches per plant, 1000-seed weight, leaf chlorophyll index, soluble carbohydrate content, and seed oil percentage, with the highest amount observed after 45% water drainage and application of 225 kg K ha-1.
Mohamad Nikbakht,; Mahmood solouki; Mehdi Aran
Abstract
In order to study the effects of foliar application of nitrogen with nano-and urea chemical fertilizers on quantitative and qualitative characteristics of bitter apple, an experiment has been conducted in a randomized complete block design with three replications at the Agricultural Institute, University ...
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In order to study the effects of foliar application of nitrogen with nano-and urea chemical fertilizers on quantitative and qualitative characteristics of bitter apple, an experiment has been conducted in a randomized complete block design with three replications at the Agricultural Institute, University of Zabol during 2019.Theexperimental treatment includes foliar application of nano-N (1000 and 2000 mg/l), urea (1% and 2%), and control. Results show that foliar application of N has had a significant effect on yield and number of fruit per bush, and shoot length, whereas it has had no effect on fruit average weight, fruit length and diameter. The highest yield per bush belongs to nano-N at 2000 mg/l concentration (961.08g) and urea at 2% concentration (864.66g) and, the highest amount of fruit number per bush (12) is found in nano-N at 2000 mg/l concentration. The highest weight of 100 seeds and seed protein are obtained from the foliar application of nano-N at concentration of 2000 mg/l and urea at 2% concentration. Seed phenol content, seed soluble carbohydrates, and oil percentage have been reduced by applying nitrogen treatments to the control. Foliar application of N has increased leaf N concentration, while having no effect on the leaf concentrations of P, K, and Zn. Given that in most measured quantitative and qualitative traits, the application of nano-N fertilizer at 2000 mg/l concentration shows better results than other treatments, this treatment can be recommended to reduce economic and environmental costs.
Hamideh Igdari; Ebrahim Ganji Mogadam; Ahmad Asgarzadeh
Abstract
Arizona Cypress (Cupressus arizonica L.) and Thuja (Thuja orientalis L.) are very important evergreen and mainly used as ornamental trees. This study was carried out in two independent experiments with the main purpose of evaluating of freezing tolerance of Arizona Cypress and Thuja with eight levels ...
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Arizona Cypress (Cupressus arizonica L.) and Thuja (Thuja orientalis L.) are very important evergreen and mainly used as ornamental trees. This study was carried out in two independent experiments with the main purpose of evaluating of freezing tolerance of Arizona Cypress and Thuja with eight levels of temperatures (control, -10, -15, -20, -25, -30, -35, -40℃) in a completely randomized design. Proline, Electrolyte leakages, Soluble carbohydrate and Re-growth were measured. Result showed that, in both species Proline and Electrolyte leakages increased. Re-growth percentage decreased dramaticaly in both species with lowering temperature level. so that any Re-growth was observed for Thuja and Arizona Cypress in the -30 and -20℃, respectively. Interactions between Soluble carbohydrate and temperature were not significant for Thuja but decreased significantly (P>0.01) in Arizona Cypress. There was a negative significant correlation between Re-growth, in Thuja (-0.895ôô) and Arizona Cypress (-0.646ôô) with temperature. According to the results, Arizona Cypress was more susceptible to freezing compared to Thuja.