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Effect of deficit irrigation at reproductive growth stage on remobilization of dry matter in four sunflower (Helianthus annus L.) cultivars
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Abstract: (3626 Views) |
| To study the effect of deficit irrigation at reproductive growth stage on quantity, efficiency and contribution of dry matter remobilization in four sunflower cultivars Azargol, Allstar, Alison and Euroflor, a field experiment was conducted at Experimental Farm of the Faculty of Agriculturale, Bu-Ali Sina University, Hamedan, Iran, in 2007 growing season. The experiment was arranged as split plot in complete randomized block design with three replications. The irrigation levels included full irrigation, deficit irrigation at heading, at flowering, at grain filing, at heading + grain filling and at flowering + grain filling stages. Results indicated that the highest grain yield was obtained from Euroflor with full irrigation treatment (75.1 g.plant -1). Deficit irrigation at grain filling stage had the lowest reduction in grain yield. The greatest remobilization was observed in cv. Alison with deficit irrigation at grain filling stage, cv. Allstar with deficit irrigation at flowering and grain filling stages followed by Euroflor with deficit irrigation at grain filling stage by 22.6, 22.4 and 22.1 g. plant -1, respectively. The highest efficiency and contribution of remobilization was observed in cv. Allstar with deficit irrigation at flowering and grain filling stages by 55.8% and 50.4%, respectively. cv. Azargol with deficit irrigation at heading stage had the lowest of remobilization and remobilization efficiency. It can be concluded that when water is limited, deficit irrigation at grain filling stage had the lowest reduction in grain yield due to remobilization of dry matter. |
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| Keywords: Sunflower, Deficit irrigation, Remobilization efficiency and Remobilization contribution |
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Full-Text [PDF 670 kb]
(1018 Downloads)
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2015/02/22 | Accepted: 2015/02/22 | Published: 2015/02/22
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