不同氮肥用量对水稻产量和氮肥利用率的影响

Effects of Different Nitrogen Application Rates on Rice Yield and Nitrogen Utilization Efficiency

以水稻品种“金农香粳1267”为试验材料,设置不同氮肥用量有机无机配施处理,研究不同氮肥用量对氮素吸收、水稻产量及氮肥利用率的影响。结果表明,有机肥+225 kgN/hm^2处理水稻高峰苗、株高、有效穗、产量优于其他处理,但各施氮量处理间无显著差异;有机肥+135 kgN/hm^2处理水稻经济效益最高。氮素农学利用率、吸收利用率、生理利用率、偏生产力随氮用量的增加而降低,有机肥+135 kgN/hm^2处理氮肥吸收利用效率最高,为35.3%。建议金山区绿色食品生产基地绿肥茬水稻合理氮用量为135~180 kg/hm^2。

With“Jinnongxiangjing 1267”as the test variety,effects of different nitrogen application rates on nitrogen absorption,rice yield and nitrogen utilization were studied.The results showed that the treatment of organic fertilizer+225 kgN/hm^2 was superior to other treatments in peak seedling,plant height,effective panicle and yield,but there was no significant difference among the treatments of nitrogen application,and the treatment of organic fertilizer+135 kgN/hm^2 had the highest economic benefits.With the increase of the amount of nitrogen,the agronomic utilization rate,absorption utilization rate and partial productivity of nitrogen decreased.The nitrogen absorption and utilization efficiency of organic fertilizer+135 kgN/hm^2 treatment was the highest,36.1%.It was suggested that the reasonable nitrogen consumption of rice in green manure stubble in Jinshan green food production base should be between 135 and 180 kgN/hm^2.