Wheat field chemical fertilizer reduction and efficiency improvement fertilization method based on green manure wheat rotation

The invention relates to the technical field of agricultural planting, in particular to a wheat field fertilizer reduction and synergism fertilization method based on green manure wheat rotation. The method specifically comprises the following steps that 1, after wheat is harvested, wheat straw is returned to the field, a straw degradation agent is sprayed, irrigation and decomposition are conducted after rotary tillage, and then green manure is planted; (2) after harvesting the green manure, turning and pressing the stubble part of the green manure to return to the field, and composting the overground part; (3) before the second crop of wheat is planted, applying the compost obtained in the step (2) as a wheat base fertilizer; 4, topdressing is conducted in the wheat jointing stage. According to the method, all the straws are subjected to field returning and composting treatment, and green manure is fermented into organic fertilizer, so that the application of chemical fertilizer is reduced, and meanwhile, t