换茬，读音huànchá，汉语词语，指一种农作物收获后换种另一种。在同一块田地上，有顺序地在季节间或年间轮换种植不同的作物或复种组合的一种种植方式。轮作是用地养地相结合的一种生物学措施，中国早在西汉时就实行休闲轮作。
山东烟田利用秋冬空闲季节种植绿肥，可起到换茬、养地、改土的作用。
Green manure is an important kind of organic manures and plays an important role in rotation, improving quality of soil nutrients.
表明该品种可以用来在种植林木苗木、蔬菜、花卉等作物时，通过间作、换茬和嫁接等方法控制土壤线虫。
The data also indicated that it can be used in cultivating forest seedlings, growing vegetables and flowers to inhibit soil nematodes in the soil by row intercrop- ping, crop rotation and grafting.
适期播种有利于提高稻麦周年的一些关键性投入的生产力，适当延迟稻麦换茬时间可以提高稻麦周年经济生产力。
Appropriate sowing date helped improve productivity with respect to key inputs, while appropriately delayed crop rotation was awarding to annual economic productivity of rice and wheat.
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