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，一土地细菌从空气中吸收氮，从而形成一种作为可的形式，这作物讲氮他们根部。

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点的，当根部分集的时候，分享相同空间的任何植物都能够得到氮。