不同氮肥用量对水田旱整机插水稻产量和氮肥利用率的影响

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。

Effects of Nitrogen Dosage on the Yield and Nitrogen Use Efficiency of Machine Transplanted Rice Using the Technology of Dry Soil Preparation in Rice Paddy Field

Objective]The research aimed to analyze the effects of nitrogen dosage on the yield and nitrogen use efficiency of machine transplanted rice using the technology of dry soil preparation in rice paddy field.Method]With conventional Japonica rice cultivar shengdao 18 as the study material,the effect of nitrogen dosage on stem and tillers dynamics,yield components and nitrogen use efficiency were investigated using the technology of dry soil preparation in rice paddy field.Result]The highest yield was 10 957.20 kg/hm2 as the nitrogen application was 315.00 kg/hm2.Meanwhile,the roughness ratio,grain-straw ratio and nitrogen use efficiency remained at a higher level.Low nitrogen application could not obtain high yield.In contrast,high nitrogen application quantity led to a significant decline in nitrogen use efficiency.Conclusion]The study could provide a scientific basis for the further promotion of the technology of dry soil preparation in rice paddy field.