论文部分内容阅读
重庆市城郊菜地因近年来只注重病虫害防治和蔬菜品种更新等方面的工作 ,忽略了土壤本身耕作、培肥与改良。再加之城市发展带来的各种污染加剧 ,致使部分菜地土壤肥力下降 ,理化性恶化 ,成为制约我市蔬菜生产再上新台阶的因素之一。主要包括 :(1)Ｎ、Ｐ、Ｋ等养分比例失调 ,即Ｎ
In recent years, the suburbs of Chongqing have focused only on pest control and the updating of vegetable varieties, ignoring the cultivation of soil itself, fertilizing and improving soil. Coupled with the urban pollution caused by increased development, resulting in part of the vegetable soil fertility decline, physical and chemical deteriorated, restricting the city’s vegetable production to a new level of one of the factors. Include: (1) N, P, K and other nutrient imbalance, that N