一、重茬栽培的障碍因素随着现代化农业的发展和人民生活水平的提高,全国设施蔬菜的面积不断增长。设施蔬菜复种指数高,倒茬相当困难,而蔬菜重茬栽培导致土壤传染性病虫害加重。如辣椒青枯病、黄瓜霜霉病以及线虫病等病虫害病菌的积累与传播,使病虫害的发生与危害加剧。同时蔬菜重茬栽 First, the obstacle factors of cropping With the development of modern agriculture and the improvement of people’s living standards, the area of ​​growing vegetables throughout the country. The high rate of multiple cropping vegetables in vegetable facilities and the stubble cropping are quite difficult. However, the cultivation of vegetable stubble leads to the aggravation of soil-borne pests and diseases. Such as pepper bacterial wilt, cucumber downy mildew and nematode disease and other pests and diseases accumulation and spread, so pests and diseases intensified. At the same time heavy vegetables planted