Well, one is green manure.

啊，绿肥是其中一种。

A green manure is a crop grown mainly to improve soil fertility.

种植绿肥作物主要是为使土壤更加肥沃。

When the green manure crop up pressure to the soil, soil rich in organic matter.

当绿肥作物翻压到土壤中，可以使土壤中的无机质丰厚。

Meanwhile, the effect of sowing rye grass mixed with green manure was discussed.

同时对“草肥混播”的效果做了初步探讨。

The nursery should open fertilizer sources, manure and planting perennial green manure.

苗圃要广开肥源，常年积肥和种植绿肥。