菜田轮作即在同一块地上,按照一定的年限,轮换栽培几种性质不同的蔬菜。这是合理利用土壤肥力,减轻病虫害的有效措施。安排蔬菜轮作应掌握以下原则: 一、要以不同科的蔬菜进行轮作。同科蔬菜有同样的病虫害的发生与危害,采取不同手斗蔬菜进行轮作,可使病原菌失去寄主或改变其生活环境,达到减轻或消灭病虫害的目的。如葱、蒜地收后种大白菜,可以减轻白菜软腐病。实行粮菜轮作、水旱轮作,对控制 Vegetable field rotation that is in the same piece of land, according to a certain number of years, rotation cultivation of several different types of vegetables. This is an effective measure to make rational use of soil fertility and reduce pests and diseases. Arrangements for vegetable rotation should have the following principles: First, we should take turns in different branches of vegetables. The same vegetables and pests have the same occurrence and harm to take different hand bucket vegetable rotation, the pathogen can lose the host or change their living environment, to reduce or eliminate pests and diseases. Such as onions, garlic harvest after planting cabbage, cabbage can reduce soft rot disease. The implementation of food rotation, drought and drought rotation, control