How Long Does It Take for Legumes to Fix Nitrogen

It is important to note it can take up to six weeks after planting before N fixation begins. Many factors determine the amount of nitrogen (N) that can be fixed by different legumes used as cover crops or forage cover crops: Different legumes fix different amounts of N.

How does a legume fix nitrogen?

Legumes are able to form a symbiotic relationship with nitrogen-fixing soil bacteria called rhizobia. The result of this symbiosis is to form nodules on the plant root, within which the bacteria can convert atmospheric nitrogen into ammonia that can be used by the plant.

Do legumes promote nitrogen fixation?

The legume-rhizobia symbiosis is an important process in agriculture because it allows the biological nitrogen fixation (BNF) which contributes to increasing the levels of nitrogen in the soil.