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标题：Timing of First Irrigation and Split Application ofNitrogen for Improved Grain Yield of Wheat in OldHimalayan Piedmont Plain of Bangladesh
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作者：M. A. Z. Sarker ; Akbar Hossain ; Jaime A. Teixeira da Silva 等
期刊名称：Current Journal of Applied Science and Technology
印刷版ISSN：2457-1024
出版年度：2014
卷号：6
期号：5
页码：497-507
语种：English
出版社：Sciencedomain International
摘要：Soil water and nitrogen (N) are the two most important factors in wheat for obtaining higher grain yield. In this context, a field trial was conducted at the research farm (25â°38´ N, 88â°41´ E and 38.20 m above sea level) of the Wheat Research Centre (WRC), Bangladesh to identify the timing of first irrigation (FItiming) and its combination with a split application of N (NSA) for improved yield of wheat. The treatments applied were two levels of N (75 and 100 kg ha−1) and different amounts of N in splits with different application times of FI to verify the FItiming in light soil and to minimize N use by rescheduling the FI. Existing wheat variety ‘Prodip’ was used as the experimental material. The interaction between FItiming and NSA on yield and yield-related components of wheat, except for 1000-grain weight, did not vary significantly. However, higher grain yield (3.39 t ha−1) was obtained when the crop was irrigated at 15 days after sowing (DAS) than when irrigated latter (20, 25 and 30 DAS). On average, higher grain yield (3.58 t ha−1) was obtained from 100 kg N ha−1 when it was applied half as basal and half as one top dressing than 75 kg N ha−1 when applied half as basal and half as one top dressing. Large grains were obtained when the FI was applied at 25 DAS in all N treatments except for 75 kg N ha−1 when applied half as basal at the time of final land preparation and half as top dressing, on 30 DAS in half N as basal at both levels of N and at 15 DAS when 100 kg N ha−1 was applied half as basal and half as top dressing. So, it is evident that the amount and split application of N with first irrigation are the most important factors determining higher grain yield and yield-related components of wheat in light soil of Bangladesh. According to our research findings, 100 kg N ha−1 is recommended, 1/2 as basal and 1/2 as top dressing at the time of FI at 15 or 20 DAS.
关键词：Verification;first-irrigation;top-dress;nitrogen;wheat