摘要
2011-2012年在江西11个县的双季稻田进行了氮肥不同施用量的试验研究。结果显示：随氮肥施用量的增加,单位氮素的水稻增产量呈下降趋势,氮素利用率和氮肥农学利用效率不断降低。利用拟合方程计算出最高产量和最佳经济产量条件下的施氮量,结合氮肥农学利用效率,确定江西早稻、晚稻的平均最佳经济施氮量分别为12.6、15.0 kg/667 m2。
The experimental studies on the optimal application rate of nitrogen fertilizer for double cropping rice were conducted in 11 counties of Jiangxi province during 2011-2012.The results showed that：along with the increase in nitrogen fertilizer application rate, the rice yield increment per unit nitrogen revealed a declining trend, and both the nitrogen utilization rate and the agronomic utilization efficiency of nitrogen fertilizer decreased unceasingly.The curve fitting equation was built to calculate the application rate of nitrogen fertilizer for obtaining the highest rice yield or the most economic rice yield.According to the calculative results combined with the agronomic utilization efficiency of nitrogen fertilizer, it was concluded that the average most economic application rate of nitrogen fertilizer for early rice and late rice in Jiangxi province was 12.6 and 15.0 kg/667 m^2 respectively.
出处
《江西农业学报》
CAS
2015年第6期102-105,共4页
Acta Agriculturae Jiangxi
基金
国家科技支撑计划"江西双季稻大面积均衡增产技术集成研究与示范"(2012BAD04B11)
国家科技支撑计划"复合(混)肥农艺配方与生态工艺技术研究"(2011BAD11B05-12)
江西省星火计划项目"省农科院广福农作物丰产科技园建设"(20135BBF61113)
关键词
江西
双季稻
产量
氮肥
施用量
Jiangxi province
Double cropping rice
Yield
Nitrogen fertilizer
Application rate
