论文部分内容阅读
坡地氮磷流失是洞庭湖农业面源污染的重要来源。以湖南省湘阴县红壤坡耕地土壤为研究对象,通过田间小区试验,探讨玉米减量施肥对产量、化肥利用率和氮磷流失量的影响。结果表明,NP常规施肥量在减少20%范围内对玉米产量没有十分显著的影响,但达到30%时玉米表现减产。减量施肥不仅一定程度提高NP化肥肥效和肥料利用率,而且降低土壤NP流失量。氮的径流量减少了12.54%～28.68%,磷减少了1.3%～30.1%。在各种减量施肥处理中,以控释肥减氮处理效果最佳,有效减少农业面源污染。
Loss of nitrogen and phosphorus in sloping fields is an important source of agricultural non-point source pollution in Dongting Lake. Taking the soil of red soil slope farmland in XiangYin County of Hunan Province as the research object, the field experiment was conducted to study the effects of reduced fertilization on yield, fertilizer use efficiency and nitrogen and phosphorus loss. The results showed that NP conventional fertilization did not have a significant effect on maize yield within 20% reduction, but maize yield was reduced at 30%. Fertilizer reduction not only to some extent improve fertilizer efficiency NP fertilizer and fertilizer utilization, but also reduce soil NP loss. Nitrogen runoff decreased by 12.54% ~ 28.68%, phosphorus decreased by 1.3% ~ 30.1%. In a variety of fertilization reduction treatment, the controlled release fertilizer nitrogen treatment best, effectively reducing agricultural non-point source pollution.