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Interactive effect of nitrogen and variety on agronomical characteristics, yield and quality of grain of rice in replanting
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Allahyar Fallah *   , Mohammad Mohammadian , Nahid Fathai , Hossein Elyasi |
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Abstract: (3682 Views) |
Abstract
Introduction: There is a possibility of two or three rice planting per year in tropical area. The rice replanting is going to be development in Mazandaran province and it was been equal 35 thousand hectare in 2016. Using more nitrogen fertilizer in paddy field, it caused environmental pollution of grand water. Therefore, the aim of this research was to determine the interactive effect of nitrogen and rice variety on agronomical characteristics and quality of Koohsar, Tarom Hashemi and Binam varieties in replanting to obtain optimum yield of rice.
Materials and methods: The a field experiment was carried out as a split plot base on randomized complete block design in 2015 and 2016, in which, varieties as main plot and rate of nitrogen fertilizer in four levels, zero, 30, 60, 90 nitrogen fertilizers as a sub-plot. Agronomical characteristics were measured in physiological maturity stage. Yield was obtained with harvesting 5 m2 and changed to hectare base on 14% paddy humidity. The 400 gr paddy samples were selected from each plot and quality and qualitative of grain characters were measured in lab.
Results: The experiment results showed that nitrogen effect was positive on agronomical characteristics and with increasing of nitrogen, agronomical characteristics improved about 15-50 percent. Harvest index of Koohsar variety was equal 41.26% in control plot (zero nitrogen) and with increasing of nitrogen levels, the harvest index significantly increased; but for Tarom Hashemi and Binam varieties it was decreased. The lowest yield (1806 Kg/ha) was related to control plot of Tarom Hashemi variety. The highest yield (3536 Kg/ha) was related to Koohsar variety in 90 kg N/ha. With increasing using of nitrogen fertilizer, yield of Koohsar, Tarom Hashemi and Binam varieties were increased, but the yield of Tarom Hashemi and Binam varieties was the same in level of 90 kg N/ha. There is no interactive effect between nitrogen and variety on quality characteristics, except, broken grain rice and gel consistency. The lower sunny hours in months of the October and November, causing to decreasing of photosynthesis of rice crop and as a result decreasing of presses of grain filling, it increased of percent of broken grain rice in replanting.
Conclusion: According of experiment results is exhibiting using 90 kg N/ha with three times split to obtain optimum rice yield in replanting are being effective.
Keywords: Amylose, Yield components, Rice, Harvest index, Nitrogen |
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Full-Text [PDF 1523 kb]
(977 Downloads)
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Type of Study: Research |
Subject:
Ecophysiology
Received: 2018/07/3 | Accepted: 2018/07/3 | Published: 2018/07/3
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