摘要
[目的]为合理施用磷肥,减轻磷素污染提供科学依据。[方法]对浙北水网平原地区青紫泥稻田施用磷肥流失进行研究。[结果]几次降雨事件中TP的累积流失负荷在0.179～0.454 kg/hm2,占当季施肥量的1.72%～1.82%;磷的径流输出负荷与降雨量存在较好的相关性;在不同磷肥施用水平,降雨径流的总磷累积流失负荷随着施肥量的增加而增加。[结论]青紫泥水稻土农田晚稻施磷(P2O5)不宜超过40 kg/hm2。
[ Objective ] The research aimed to provide the scientific basis for the reasonable utilization of P fertilizer and the alleviation of P contamination. [ Method] P runoff in rice field of purple slurry in water network of north Zhejiang was studied. [ Result] The discharge of TP in several rainfall events reached 0.179 - 0.454 kg/hm2 , accounting for 1.72% - l. 82% of fertilizer amount. There was good relationship be- tween the discharge of P runoff and rainfall capacity. The discharge of TP increased with the increase of phosphorus fertilizer amount. [ Con- clusion] The amount of phosphorus fertilizer amount shouldn＇ t above 40 kg/hm2.
出处
《安徽农业科学》
CAS
2012年第13期7767-7768,7815,共3页
Journal of Anhui Agricultural Sciences
关键词
磷素
径流
青紫泥
Phosphorus
Runoff
Purple slurry
