crop rotation
noun [ U ] uk/ˈkrɒp rəʊˌteɪ.ʃən/ us/ˈkrɑːp roʊˌteɪ.ʃən/
庄稼轮作
a method of farming where a number of different plants are grown one after the other on a field so that the soil stays healthy and fertile (= able to produce crops)