Based on the maximum nitrogen application rate of 225 kg/hm2,four nitrogen application levels were designed to study the effects of nitrogen reduction application on rice dry matter accumulation,yield and nitrogen utilization rate from April to Septem-ber 2022 in Huangcun Village.The results showed that the variation of dry matter accumulation in the growing season of rice under different nitrogen application treatments ranged from 2.38 to 18.07 t/hm2,and the maximum value was reached at the mature stage.The maximum dry matter accumulation was 18.07 t/hm2 when the nitrogen application rate was 150 kg/hm2.The effective panicle number,grain number per panicle,thousand grain mass and yield of rice increased first and then decreased with the increase of nitro-gen application rate,and reached the maximum value at the 150 kg/hm2 nitrogen application rate.Meanwhile,the indexes of nitrogen absorption and utilization rate also increased significantly compared with the 225 kg/hm2 nitrogen application rate.
关键词
水稻/氮肥减施/干物质积累量/产量/氮素吸收利用
Key words
rice/nitrogen fertilizer reduction/dry matter accumulation/yield/nitrogen absorption and utilization
维普
万方数据