A lot of research results showed that the main causes of continuous cropping obstacle are accumulation of harmful microbes, salinization of soil, auto-toxicity of vegetable crops etc.

• 大量的研究表明，引起蔬菜作物连作障碍的主要原因有土壤中有害微生物的积累、土壤的次生盐渍化、蔬菜作物的自毒作用等。