For example, some kinds of soil back bacteria take nitragin nitrogen from the air and make a form that plants can use.The plants keeps keep the nitragin nitrogen in the their roots.

例如，一土地空气中吸收氮，而形成一种作为可以利用形式，这作物讲氮保存在他们根部。

Legumes are especially good of itat this. any Any crops are sharing the thing same space , and can get the nitragin nitrogen as the root did composeroots decompose.

豆类植物是尤其擅长这一，根部分集时候，分享相同空间任何植物都能够得到氮。