ali naderi arefi
Abstract
In order to investigate the effects of reduced row spacing from usual 75 cm to 25 cm (UNR), an experiment has been conducted in two locations: Davarabad agricultural research station (Semnan Province) and Varamin Central Agricultural Research Station. The experimental design is RCBD laid out in split ...
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In order to investigate the effects of reduced row spacing from usual 75 cm to 25 cm (UNR), an experiment has been conducted in two locations: Davarabad agricultural research station (Semnan Province) and Varamin Central Agricultural Research Station. The experimental design is RCBD laid out in split plots with three replications. The main plots are the planting dates (May 22 and Jun 5, 2020) and five cultivars, i.e. Khorshid, Kashmar, Sajedi, Hekmat, and Khordad serve as the sub plots. The results show that location effect on vegetative and reproductive attributes has been significant. UNR boosts the yield in Aradan, but in Varamin region, this planting method, not only has failed to increase the yield, but has reduced it significantly. This is due to reducing the boll number as a result of rank growth of plants in UNR system. Reduction of row spaces from 75 to 25 cm enhances the number of monopodials, sympodials, and plant height. In Varamin, plant height of all cultivars are higher than 119 cm. the highest yield in this region obtained from Khordad as Control (3886 kg seed ha -1). The highest yield in Aradan, obtained from Khorshid (5702.5 kg seed ha -1) in UNR system. This shows that the UNR planting of zero type varieties is more adabtable for Garmsar condition than that of Varamin.
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.
Hossein Sadeghi; Hossein Heidari sharifabad; Aidin Hamidi; Ghorban Nourmohammadi; Hamid Madani
Abstract
In order to study the canopy temperature effect on protein and soluble sugar, oil percentage and yield of soybean in different planting dates, an experiment was conducted as factorial based on Randomized Complete Block Design with three replications in Karaj and Moghan areas during 2012-13. The studied ...
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In order to study the canopy temperature effect on protein and soluble sugar, oil percentage and yield of soybean in different planting dates, an experiment was conducted as factorial based on Randomized Complete Block Design with three replications in Karaj and Moghan areas during 2012-13. The studied treatments were included cultivar (‘Williams’ and ‘L17’) and planting date (5th of May, 5th of June and 5th of July). Results showed that the soluble protein content was not affected by studied factors. The highest oil percentage (22.38%) in both areas was related to first planting date, also second and third planting dates with 18.8 and 17.72% respectively were arranged in the next levels. In Karaj area, the maximum rate of soluble sugar (73.17 mg/g grain) was obtained at third planting date but in Moghan area, it (72.12 mg/g grain) was observed at second planting date. Furthermore the highest yield (3679 kg/ha) was attained at second planting date in both areas while also third and first planting dates with 3160 and 3000 kg/ha were putted in the next levels. Results showed that although the oil percentage at 5th of May planting date was higher than the other planting dates, but the rate of yield and soluble sugar were decreased at this planting date, because of encountering the pod set and grain filling stages with higher temperature. So, in order to prohibition of this problem occurrence, it is suggested that soybean doesn’t plant in May and it be postponed until the mid of June.