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Effect of drought stress in different growth stages on grain yield and yield components of rapeseed (cv. Talayeh)
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Abstract: (4474 Views) |
| This experiment was conducted to assess the effect of drought stress on yield and yield components of canola (cv. Talayeh) during 2008-2009 growing season, in Bajgah Research Station, College of Agriculture, Shiraz University, Shiraz, Iran. The experimental design was randomized complete block design and treatments included full irrigation during the growing period, water stress in the spring re-growth stage, water stress in the flowering and silique formation stage, water stress in the grain filling stage and rainfed with the supplemental irrigation at the beginning of the season (sowing and germination stage). Results indicated that rainfed treatment and irrigation in flowering and grain formation stage were highly and least affected with grain yield of 750 and 2980 kg.ha-1, respectively. Water stress in flowering and silique formation stages had the least effect on plant dry weight. The highest harvest index was obtained in water stress in spring re-growth stage (51%) while the lowest harvest index (41% and 31%) was obtained in flowering and rainfed conditions, respectively. Calculated crop sensitivity coefficients showed that rapeseed is more sensitive to water stress in the period between the spring re-growth and the beginning of flowering stages. It is concluded that using the calculated crop sensitivity coefficients, an appropriate estimation of rapeseed yield could be achieved for being used in crop yield models under similar conditions. |
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| Keywords: Crop models, Crop sensitivity coefficient, Drought stress and Rapeseed |
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Full-Text [PDF 478 kb]
(3664 Downloads)
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2015/02/16 | Accepted: 2015/02/16 | Published: 2015/02/16
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