returning straw to soil

• 秸秆还田

returning straw to soil的用法和样例：

例句

1. Maize straw returning to the field can increase the soil total nitrogen and inorganic nitrogen content.
   秸秆还田增加了土壤全氮和无机氮含量。
2. Soil organic matter contents can also be raised through continuously plowing under stalks into land.
   同时，近年来秸秆还田的增加有助于提高土壤有机质含量。