针对长期不合理高化肥投入量导致城郊区菜地土壤环境恶化的现状,为探讨氮肥减施对城郊区菜地土壤氮磷累积及蔬菜产量品质的影响,应用田间小区试验,研究了长沙市郊2种不同菜地土壤中,氮肥减施20%与缓释尿素,脲酶抑制剂/硝化抑制剂,土壤调理剂配合施用的环境和农学效应。结果表明:与常规施肥处理相比,采用缓释尿素减施20%化学氮肥(80%N(CRU))有效降低了菜地土壤Olsen-P和NO3--N的含量,减少了其面源污染风险,但该处理蔬菜可食部分容易累积硝酸盐,也增加了食用风险;通过添加脲酶抑制剂/硝化抑制剂减施20%
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