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Effect of different nitrogen and zinc levels on grain yield and yield components of wheat (Triticum aestivum L.) cv. Chamran under late season heat stress conditions in Ahvaz
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Seyed Nader Mosavian   , Naser Akbari , Hamid Reza Eisvand * , Ahmad Ismaili , Ali Moshatati |
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Abstract: (2104 Views) |
| In order to evaluate the effect of late-season heat stress on grain yield and yield components of wheat under nitrogen and zinc application, a split-split plot experiment based on RCBD in four replications was carried out in an experimental field of Khuzestan agriculture and natural resources university during 2017-18 growing season. Experimental factor was three planting date including 22 November (appropriate planting date), 11 December (late planting date) and 31 December (very late planting date) on the main plot, nitrogen in four levels (0.0, 75, 150 and 225 kg ha-1) in subplots and zinc in three levels (0.0, 10 and 20 kg ha-1) in subplots.The grain yield of wheat was reduced by 40% with heat stress. Grain yield of wheat was affected more by grain number (reduction of grain number per unit area and grain weight was 38% and 20%, respectively). Nitrogen diminished the effect of heat stress on grain yield of wheat through increasing the grain numberbecause the increase if nitrogen application resulted in a 3.27% reduction of grain weight. Zinc application reduced the effect of heat stress on grain yield through an increase of about 24% by weight of grain. Since the effect of late-season heat stress on the reduction of grain yield of wheat (39% reduction) was more than biological yield (31%), harvest index of wheat was reduced 18% by heat stress. In general, the application of 150 kg ha-1 N and 10 kg ha-1 ha Zn can reduce the enative effects of late-season heat stress on grain yield of wheat. |
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| Keywords: Yield components, Harvest index and Leaf area index. |
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Full-Text [PDF 1019 kb]
(2102 Downloads)
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Type of Study: Applicable |
Subject:
Crop Physiology
Received: 2020/06/1 | Accepted: 2020/06/1 | Published: 2020/06/1
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