氮素运筹对钵形毯状硬盘育秧机插水稻产量及氮素吸收利用的影响

Effects of Nitrogen Application on the Yield and Nitrogen Use Efficiency of Mechanically Transplanted Rice with Pot-mat Seeding

[目的]研究氮素用量、运筹对钵形毯状秧苗机插水稻产量和氮肥吸收利用的影响。[方法]以中熟中粳品种连粳7号为供试材料,研究氮素用量、运筹对钵形毯状秧苗机插水稻产量结构、茎蘖动态、叶绿素含量和氮素吸收利用等的影响。[结果]施氮量为300 kg/hm2时,产量最高(11 023.80 kg/hm^2),并能获得较高的出糙率、谷草比和氮肥吸收利用率,过低施氮量处理不能获得高产,过高施氮量处理的氮素吸收利用率显著下降。[结论]钵形毯状秧苗机插连粳7号,在基蘖肥∶穗肥=6.5∶3.5、施氮量为300 kg/hm2时产量和氮素吸收利用率最佳。

[Objective] To analyze the effects of nitrogen application on the yield and nitrogen use efficiency of mechanically transplanted rice with pot-mat seeding. [Method] Late maturity and medium japonica rice lianjing No. 7 were used as the study material,and the differences in yield structure,dynamic changes of stem and tillers,chlorophyll content and nitrogen use efficiency were investigated. [Results]The highest yield was 11 023. 80 kg / hm2 as the nitrogen application was 300 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,too high nitrogen application leads to a significant decline in nitrogen use efficiency. [Conclusion] In view of high yield and nitrogen use efficiency,the nitrogen application at 300 kg / hm2 is the optimal value.