【摘要】 阐述了不同水平有机肥及无机N肥长期定位施用对露地土壤 -蔬菜生态系统变化的影响 ,明确指出长期偏施N肥明显地破坏该系统的结构 ,降低系统的功能 ,配施有机肥可在一定程度上得到改善 ,但在土壤肥力提高到一定水平后应增施P、K肥 ,防止土壤养分平衡的失调。更多还原

【Abstract】 The effects of long term organic and inorganic nitrogen fertilizer(2 facters,3 levels) application on vegetable soil ecological system were discussed in this paper.The structure and function of soil vegetable system were significantly influenced by partial long term nitrogen fertilization.The soil productivity was increased obviously by fertilizing chemical nitrogen in combination with organic manure.But under the conditon of high level of organic manure application phosphorus,potassium fertilizers should be applied in order to keep the soil nutrition balance.更多还原