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[目的]研究不同氮肥用量对水田旱整机插水稻产量和氮肥吸收利用率的影响。[方法]以常规粳稻品种圣稻18为试验材料,研究了水田旱整条件下,氮肥用量对水稻的茎蘖动态、产量构成、氮肥吸收利用率的影响。[结果]施氮量315.00 kg/hm~2时水稻产量最高,达到10 957.20 kg/hm~2,并能获得较高的出糙率、谷草比和氮肥利用率,过低施氮量不能获得高产,过高施氮量则氮肥利用率显著下降。[结论]该研究可为水田旱整技术的进一步推广提供科学依据。
[Objective] The research aimed to study the effects of different amount of nitrogen fertilizer on paddy rice yield and N use efficiency in paddy field. [Method] With the conventional japonica rice variety Shengdao 18 as test material, the effects of nitrogen fertilizer on stem tillering dynamics, yield components and N fertilizer use efficiency were studied under arid and land conditions of paddy field. [Result] The highest rice yield was reached at the rate of 315.00 kg / hm ~ 2, reaching 10 957.20 kg / hm ~ 2, and higher utilization rate of roughness, ratio of straw to grain and nitrogen could be obtained. High yield and high N application rate significantly decreased nitrogen use efficiency. [Conclusion] This study could provide a scientific basis for the further popularization of dry-farming technology in paddy fields.