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一年内或连年在同一土地上重复栽种相同作物,而茬口相同,这种种植制度叫重茬。重茬容易造成相同病虫害的猖厥、某种元素缺乏、根系分泌的有机酸及有毒物不易消除和土壤pH值改变较大。茄科(尤其茄子)、葫芦科(尤其西瓜)、豆科、菌科等蔬菜最怕重茬;伞形科、百合科、十字花科、禾本科蔬菜相对能忍耐重茬。可采取如下措施减轻连作障碍:
Within a year or year after year on the same land repeatedly planted the same crop, and stubble the same, this cropping system is called stubble. Cropping is likely to cause the same pests and diseases, the lack of a certain element, root exudation of organic acids and toxic substances is not easy to eliminate and the soil pH changes. Solanaceae (especially eggplant), Cucurbitaceae (especially watermelon), legumes, fungi and other vegetables are most afraid of cropping; Umbelliferae, Liliaceae, Cruciferae, Gramineae vegetables are relatively able to endure cropping. The following measures can be taken to mitigate the obstacle of continuous operation: