Effects of Nitrogen Fertilizer Management on Rice Yield and Nitrogen Utilization Efficiency
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摘要: 以水稻"甬优6号"为试验材料,在总施氮量不变的情况下,通过设置4种生育前后期不同的氮肥施用比例,考查了不同氮肥运筹比例对水稻生长、产量及氮素利用率的影响。结果显示,适当的前氮后移施肥方式(N3处理:基蘖肥:穗粒肥=6:4),能够有效地延缓叶绿素的降解,减少无效分蘖,提高水稻成穗率,并且N3处理下氮素积累量、水稻农学利用率以及生理利用率均达最高值,水稻产量也达最高。由此可见,适当的前氮后移能够优化水稻的群体结构,提高氮肥的利用效率,进而促进水稻高产潜力的发挥。Abstract: Nitrogen (N) fertilizer management is one of the important factors in the rice cultural regulation, which plays a significant role in the growth of rice.Using the rice cultivar Yonyou No. 6 as experimental material, four different N application proportions at the early and late growth stages were carried out to understand the effects of N fertilizer management on rice yield and N utilization efficiency. In detail, the N application rates were the same for each treatment, but the N application proportions at the early and late growth stage were 4:6 (N1), 5:5 (N2), 6:4 (N3) and 7:3 (N4), respectively. The results indicated that appropriate N application rates at late growth stage, for example, N3 treatment (6:4), could effectively slow down the degradation of chlorophyll, reduce ineffective tillers and increase rice spike rate, which led to the high yield of rice. Moreover, the N accumulation, rice yield, agronomic and physiological nitrogen utilization rate in N3 treatment were more than other treatments. It's concluded that a optimized method of N fertilizer management could play an important role in the yield formation of Yonyou No. 6.
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Key words:
- rice /
- nitrogen /
- yield /
- nitrogen utilization efficiency
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[1] 丁艳锋,刘胜环,王绍华,等.氮素基、蘖肥用量对水稻氮素吸收与利用的影响[J].作物学报,2004,30(8):739-744 [2] 黄卫群,郝兴顺,冯志峰,等.不同氮肥水平下水稻干物质生产量及氮素利用率研究[J].陕西农业科学,2010,4:7-9.
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