种植绿肥作物主要是为使土壤更加肥沃。
A green manure is a crop grown mainly to improve soil fertility.
苗圃要广开肥源，常年积肥和种植绿肥。
The nursery should open fertilizer sources, manure and planting perennial green manure.
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.
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