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Effect of water stress and different levels of nitrogen fertilizer on seed yield and its components, nitrogen uptake and water use and nitrogen utility efficiency in two rapeseed (Brassica napus L.) cultivars
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Abstract: (3555 Views) |
| In order to determine the effects of water deficit and different nitrogen levels on seed yield, yield components, water use efficiency, nitrogen utility efficiency and uptake in rapeseed, a field experiment was conducted using a factorial split-plot in randomized complete block design in 2005 growing season. In this study, two cultivars (Zarfam and Modena), three water regimes (irrigation after 40, 60 and 80 percent depletion of soil water) and four nitrogen levels (0, 75, 150 and 225 Kg/ha) was studied. Results showed that increasing the nitrogen rate from 0 to 220 kg/ha and increase in soil water, caused increasing the total biomass production that was accompained by increasing the seed yield. Increasing the seed yield, was related to increasing the number of pods per plant and number of seeds per pod in both conditions. With increasing the ntirgoen and soil water, water use efficiency (seed and total biomass) was increased. The maximum rate of these efficiency, obtained from 220 kg N and 40 percent depletion of soil water. Nitrogen accumulation in all plant organs and nitrogen uptake, increased with increasing nitrogen and watering times. In contrast, nitrogen utility efficiency decreased with increasing nitrogen used and decreasing soil water that finally improved the seed yield and total biomass. Zarfam had a higher nitrogen uptake and mobilization under normal irrigation and severe water stress conditions, and also in higher and lower nitrogen conditions and produced higher seed yield. |
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| Keywords: Rapeseed, Water stress, Nitrogen, Yield, Yield components, Water use efficiency, Nitrogen utility efficiency. |
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Full-Text [PDF 272 kb]
(972 Downloads)
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2015/02/28 | Accepted: 2015/02/28 | Published: 2015/02/28
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