Green manure returning method

The invention relates to the technical field of agricultural planting, in particular to a green manure returning method which comprises the steps that according to the first sowing amount, multiple green manure is sown in a shallowly-rotating and strip-sowing mode; irrigating and fertilizing each kind of green manure in the step 1; according to the soil water storage capacity and the soil nitrogen content, any one of the multiple green manure in the first step is selected as target green manure, and the green manure returning amount, the smashing degree and the returning depth of the target green manure are selected; detecting soil biomass, and determining a second seeding rate according to a formula 1; according to the target green manure in the step 3 and the second sowing amount in the step 4, the green manure is sown in a shallow rotary drill sowing mode, and irrigation and fertilization are conducted on the green manure; crushing the green manure in the step 5 according to the returning amount and crushi