▎ 摘　　要

NOVELTY - Soil biological nitrogen removal agent comprises 0.01-5 wt.% graphene sol solution, 0-10 wt.% jelly-like Bacillus, 1-10 wt.% denitrifying bacteria, 0.1-5 wt.% potassium dihydrogen phosphate, 10-15 wt.% water, 30-40 wt.% bran. The remaining amount of solid filler. The above graphene melt solution is formed by nano-treatment. The proportion of graphene particles with a diameter of not more than 200 nm should not be less than 10%. USE - Soil biological nitrogen removal agent. ADVANTAGE - The soil biological nitrogen removal agent solve the secondary nitrate accumulation harm in protected cultivation soil, reduce the enrichment of nitrate nitrogen in protected cultivation crops, and improve the quality of agricultural products. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a a method for preparing soil biological nitrogen removal agent, which comprises proporting; adding the jelly-like Bacillus, denitrifying bacteria, and graphene sol to the water slowly and successively under stirring conditions, and continuously stirring for 0.5-1 hour, preparing dispersed graphene bacteria mixed liquid, and mixing the dispersed graphene bacteria mixed liquid with bran or bran from little to at most, and stirring until the mixture is uniform; and mixing mixture gradually with potassium dihydrogen phosphate and solid filling material from 100-100 wt.% in a slow stirring condition, and stirring the mixture and mixing for 0.5-1 hour to obtain soil organisms; and (2) a method for using soil biological denitrifier, where the purpose is to improve the secondary nitration of soil in facility cultivation, that is, to apply soil biological denitrifying agent on the surface of the tillage layer in an amount of 1-10 kg per acre; and plowing into the soil tilling layer and leveling into a ridge or box, and then covering the surface with a mulch, and the surrounding edges of the mulch are buried under a thin layer of soil to form a relatively sealed environment, and the restoration is completed in 14-21 days, during which the mulch film is opened 1-2 times.