The green manure essentially comprises of green rotten crops or plants. Certain agricultural practices involve growing of certain useless crops simply to plow them under so as to provide green manure to the agricultural land.

This crops when rotten nourish the soil with their nutrients. Mainly these crops are described as cover crops which are meant to serve the purpose of nourishing the dead soil. However not only this, these cover crops also serve the fertility of the soil in various other means as well. These cover crops are more often leguminous crops which along with the rhizobium bacteria synthesize nitrogen and thus enhance the soil fertility.

These multipurpose crops also increase the biomass of the soil by great margins, and promote water retention, aeration, and other soil characteristics. By exerting the soil in the roots, these cover crops like vetch or clover also prevent soil