Joint control method for nitrogen and phosphorus emissions

A joint control method for nitrogen and phosphorus emissions in farmlands, comprising:

• a. laying a composite barrier material on the lower layer of crop roots, wherein the composite barrier material comprises the following components in parts by weight:
• 25-35 parts of straw-based hydrogel, 20-30 parts of edible fungi residues, 35-55 parts of bentonite and 5-10 parts of corn flour;
• b. adding a composite microbial agent to a distribution layer of the crop roots, and simultaneously adding edible fungi residues and straw-based hydrogel;
• c. performing farmland fertilization:
• applying a composite organic material sim and a chemical fertilizer to farmlands as a basic fertilizer during crop sowing or planting, wherein the amount of the basic fertilizer is 40-55% of the nutrient amount required during the whole growth period of crops;
• wherein the composite organic material consists of the following components in parts by weight:
• 200-250 parts of edible fungi residues, 300-350 parts of charcoal and 5-10 parts of rhamnolipid, wherein the composite organic material is mixed, and then fermented at 40-60° C. for 20-30 days.