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[目的]研究减量施肥对水稻生长,稻田水体N、P含量的影响。[方法]在当地习惯施肥和施用绿肥红浮萍的基础上,设减量施肥处理,测定各组处理的水稻农艺性状,产量,N、P利用率,稻田水中总N、P在各个生长时期的变化情况。[结果]从产量方面看,红浮萍+当地习惯减10%处理的产量较高,为8537.55kg/hm2,与当地习惯处理相当,但比当地习惯减10%处理、当地习惯减20%处理、红浮萍+当地习惯减20%处理分别增产16.1%、25.2%、16.3%;红浮萍+当地习惯减10%处理的N、P利用率较高,分别为40.8%、40.7%,而当地习惯减20%处理最低,分别仅为23.5%、20.8%;红浮萍+当地习惯减10%处理与当地习惯处理比较,稻田水N含量相当,而P含量较低。[结论]综合评价,红浮萍+当地习惯施肥量减10%处理可减少N、P的流失,且不影响水稻的产量。
[Objective] The research aimed to study the effects of reduced fertilization on the content of N and P in paddy field water and rice growth. [Method] Based on the local practices of fertilization and application of green manure and red duckweed, the fertilization treatment was set to determine the agronomic traits, yield, N and P utilization rate of rice, total N and P in paddy water in each growth period Changes in the situation. [Result] From the aspect of yield, the yield of Hongduping + local habit decreased by 10% was 8537.55kg / hm2, which was equivalent to local habitual treatment, but decreased by 10% than local habit and local habit decreased by 20% , Red duckweed + local habits by 20%, respectively, 16.1%, 25.2%, 16.3%; Red duckweed + local habits by 10% of N, P utilization were higher, respectively, 40.8%, 40.7% The local habit of reducing 20% of the lowest treatment, respectively, only 23.5%, 20.8%; Red duckweed + local habits by 10% treatment Compared with the local habit of treatment, paddy water N content is relatively low, while P content is low. [Conclusion] According to the comprehensive evaluation, the red duckweed + local habit of reducing fertilizer by 10% could reduce the loss of N and P, and did not affect the yield of rice.