施氮量对双季超级稻产量、干物质生产及氮素吸收利用的影响

Effects of Nitrogen Application Amount on Yield,Dry Matter Production and N-uptake and Utilization of Double-cropping Super Rice

以超级杂交早稻淦鑫203和超级杂交晚稻淦鑫688为材料,研究了施氮量对双季超级稻产量、干物质生产及氮素吸收利用的影响。结果表明,淦鑫203在施氮量为207 kg/hm2时产量最高,淦鑫688在施氮量为232.5 kg/hm2时产量最高;淦鑫203和淦鑫688分别在施氮量为234 kg/hm2和232.5 kg/hm2时的干物质生产量最大;淦鑫203在施氮量为153 kg/hm2时氮肥利用率最高,淦鑫688在施氮量为197.7 kg/hm2时氮肥利用率最高。认为淦鑫203和淦鑫688在生产中的合理施氮量可以分别确定为180～207 kg/hm2和197.7～232.5 kg/hm2。

The effects of the amount of nitrogen application on the yield,dry matter production and nitrogen uptake and utilization of double-cropping super rice were studied with super early hybrid rice Ganxin 203 and super late hybrid rice Ganxin 688 as the materials.The results showed that Ganxin 203 and Ganxin 688 had the highest yield when the amount of nitrogen application was 207 and 232.5 kg/hm2,respectively.Ganxin 203 and Ganxin 688 had the highest dry matter production when the amount of nitrogen application was 234 and 232.5 kg/hm2,respectively.Ganxin 203 had the highest nitrogen use efficiency when the amount of nitrogen application was 153 kg/hm2,while Ganxin 688 had the highest nitrogen use efficiency when the amount of nitrogen application was 197.7 kg/hm2.It is concluded that the reasonable amount of nitrogen application in the production of Ganxin 203 and Ganxin 688 can be identified as 180~207 and 197.7~232.5 kg/hm2,respectively.