Question

crops like sunn hemp are grown in the field before sowing the seeds and are then ploughed back into the soil when seedlings are young. This is done to prepare ​

Answer 1

Green manure: Prior to the sowing of the crop seeds, some plants like sun hemp or guar are grown and then mulched by ploughing them into the soil. These green plants thus turn into green manure which helps in enriching the soil in nitrogen and phosphorus.