Preparation of slow-release coated urea with modified straw and its fertilizer efficiency

The oil absorption and hydrophobic properties of straw fiber increased through modification, the slowrelease coated urea was prepared with the modified straw by principle of industrial disc granulator, and its fertilizer efficiency on corn was studied by field test. The results indicated that after modification, the oil absorption increased by 50.5% ; FTIR showed that carbonyl absorption enhanced, the degree of acetylation increased; high power microscope and SEM showed that the coating layer formed a dense film structure. The field test results showed that, compared to control group, by application of the slow -release coated urea with modified straw, the chlorophyll content, stem circumference, plant height and leaf area of corn significantly increased, indicating that the slowrelease coated urea had good release effect and could improve crop yield to a certain extent