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[目的]研究甬籼975最佳氮肥施用量。[方法]设5个氮肥施用量处理和1个空白对照,小区净面积13.4 m2,3次重复,随机区组排列。[结果]各施氮处理间产量无显著差异;施纯氮210.0 kg/hm2时穗、粒、重较为协调,增产潜力大;施纯氮270.0 kg/hm2时实割产量最高,收益最好,但其肥料利用率较差,同时病虫害和倒伏风险加大,生态负担重;施纯氮150.0 kg/hm2时肥料利用率最高,产量高,经济效益好。[结论]综合考虑高产、稳产、效益,在高肥力大田中甬籼975纯氮施用量控制在150.0 kg/hm2左右为佳;当大田肥力中等或偏低时纯氮施用量可增至180.0 kg/hm2左右;为发掘其高产潜力,在高产攻关田纯氮施用量可增至210.0 kg/hm2左右。
[Objective] The research aimed to study the best nitrogen fertilizer application rate of Nong Indica 975. [Method] Five N application rates and one blank control were set up. The net area of the plot was 13.4 m2, repeated three times and arranged randomly. [Result] There was no significant difference in the yield of nitrogen fertilizer between different treatments. Spike, grain and weight of 210.0 kg / hm2 of pure nitrogen were more coordinated and the potential for yield increase was larger. When the pure nitrogen of 270.0 kg / hm2 was applied, the actual yield was the best, However, the fertilizer utilization rate is poor, and the risks of pests and lodging are increased, and the ecological burden is heavy. When the pure nitrogen of 150.0 kg / hm2 is applied, the fertilizer utilization rate is the highest, the yield is high, and the economic benefit is good. [Conclusion] Considering the high yield, stable yield and benefit, the application rate of Nongnian 975 pure nitrogen was about 150.0 kg / hm2 in high fertility field. When the field fertility was medium or low, the application of pure nitrogen could be increased to 180.0 kg / hm2; In order to explore its high yield potential, the application of pure nitrogen in high yield field can be increased to about 210.0 kg / hm2.