Ghorban Khodabin; Zeinolabedin Tahmasebi-Sarvestani; Amir Hossein Shirani rad; Esmaeil Bakhshandeh; Mojdeh Sadat Khayat Moghadam; Shahryar Kazemi; mahsa rafati alashti; ali heidarzadeh
Abstract
In order to study the effects of late-season drought stress and foliar application of zinc sulfate (ZnSO4) and manganese sulfate (MnSO4) on physiological characteristics and yield of rapeseed cultivars, a factorial split-plot test has been conducted in a randomized complete blocks design for two cultivation ...
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In order to study the effects of late-season drought stress and foliar application of zinc sulfate (ZnSO4) and manganese sulfate (MnSO4) on physiological characteristics and yield of rapeseed cultivars, a factorial split-plot test has been conducted in a randomized complete blocks design for two cultivation years (2017-2019) in Karaj, Iran. The experimental treatments include two levels of irrigation (full irrigation (control) and withholding irrigation from flowering stage) and four levels of foliar application (control, ZnSO4, and MnSO4, separately, as well as their combined application) as factorial in the main plots, with rapeseed genotypes (Nima, Niloofar, and KS7) considered as subplots. Combined foliar application of zinc and manganese sulfate under full irrigation conditions increase the content of seed oil and soluble carbohydrates by 3% and 11%, respectively, compared to the control. On the other hand, withholding irrigation from flowering stage increases the percentage of seed oil and leaf proline content, compared to the control by 9% and 5.2%, respectively. Niloofar genotype has had the highest seed yield (5261 kg/ha) under full irrigation conditions, i.e. 9% and 11.8% higher than KS7 and Nima genotypes, respectively. Nima genotype with 3371 kg/ha has had the highest yield in the conditions of withholding irrigation. In general, in both irrigation treatments, simultaneous foliar application of zinc sulfate and manganese has had the greatest impact on the physiological traits of the studied genotypes, thus Niloofar genotype is recommended for full irrigation and Nima genotype for interrupted irrigation.
Maryam Divsalar; Zeinodin Tahmasbi Sarvestani; Seyed Ali Mohammad Modares Sanavi; Aidin Hamidi
Abstract
In order to assess the performance of two soybean cultivars produced in two regions including Karaj and Moghan to drought stress at reproductive stages and also the impact of drought stress on yield and its components, oil and protein percent, an experiment was conducted as a split factorial based on ...
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In order to assess the performance of two soybean cultivars produced in two regions including Karaj and Moghan to drought stress at reproductive stages and also the impact of drought stress on yield and its components, oil and protein percent, an experiment was conducted as a split factorial based on complete randomized block design in three replications in agriculture faculty of Tarbiat Modares University during 2014. Four treatments of drought stress were exerted as complete withholding irrigation at flowering stage (R1-R3), pod formation (R3-R5), seed filling stage (R5-R7) and control (no withholding of irrigation) which were placed in main plot and other treatments were two soybean cultivars (‘Williams’ and ‘L17’) and two seed production sources (Karaj and Moghan) that were placed in sub plots. The results indicated that the effect of drought stress on pod number, 1000-seeds weight, seed yield and also oil and protein percent was significant. The highest seed yield (262.73 gram per meter square) was observed in control (no stress) and the lowest yield (162.22 gram per meter square) belonged to drought stress at pod formation stage. Also the interactions of drought stress × cultivar and drought stress × seed source were significant on grain yield. The lowest seed oil percent (18.24 percent) and the highest protein percent (37.28 percent) of seeds were obtained at seed filling stage. With considering these results, the irrigation at pod formation stage (R3-R5) is necessary for preventing the reduction of soybean seed’s yield.