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潮土肥力定位试验进行过程中 ,于 1994年探讨土壤剖面NO3 -N不同时空动态分布以及对作物产量、环境质量和地下水质的影响。结果表明 :NPK平衡施肥与有机、无机肥配施 ,在本试验的施肥水平和配合比例条件下 ,小麦—玉米(大豆 )轮作制获得较高的产量。单施N、NK的土壤剖面中NO3 -N含量经常处于超标状态 ,构成了对土壤环境和地下水质的污染。降水、灌溉水量、N肥用量以及肥料利用率是影响土壤NO3 -N淋洗、积累的主要因素
In 1994, the dynamic distribution of NO3-N in soil profile and its effects on crop yield, environmental quality and groundwater quality were investigated. The results showed that NPK balanced fertilization combined with organic and inorganic fertilizers achieved higher yield under wheat-corn (soybean) rotation system under the fertilization level and compounding ratio in this experiment. The content of NO3-N in the soil profile of N and NK alone is often in an excessive state, which constitutes the pollution of soil environment and groundwater quality. Precipitation, irrigation water, N fertilizer use and fertilizer utilization rate are the main factors affecting soil NO3-N leaching and accumulation