In view of the problem of fertilizer clumping and blocking the fertilizing port in mechanical fertilization, this study prepared 5 kinds of slow-release BB fertilizers by mixing different types of fertilizers, and used regional tests to study the effects of slow-release BB fertilizers and quick-release fertilizer on wheat and corn yield, nitrogen fertilizer utilization rate and soil nutrients on sandy loam paddy soil. The results showed that compared with quick-release fertilizer, slow-release BB fertilizer 3 and slow-release BB fertilizer 4 increased the yield of corn and wheat, the yield of corn increased by 10.7% and 5.7%; wheat increased by 10.3% and 11.6%, respectively. The thousand grain weight of corn increased by 4.3% and 3.4%; wheat number of ears per mu increased by 10.5% and 6.5%. Nitrogen fertilizer use efficiency increased, the corn season increased by 19.6 and 15.0 percentage points, respectively; the wheat season increased by 15.0 and 12.9 percentage points, respectively. Phosphorus absorption in wheat season increased by 15.8% and 11.9%, respectively. Soil organic matter increased, the corn season increased by 8.5% and 6.6%; the wheat season increased by 17.9% and 15.2%, respectively. The pH value of the soil decreased by 0.27 and 0.22 after corn harvest. The available phosphorus increased by 7.8 and 8.9 mg/kg after wheat harvest, respectively. Wheat season, 0-20cm soil total nitrogen increased by 0.25 and 0.26g/kg, respectively; 20-40cm decreased by 0.29 and 0.05g/kg, respectively; 40-60cm decreased by 0.01 and 0.1g/kg. Considering all the indexes, on sandy loam tidal soil , compound slow-release BB fertilizer 3, namely chlorinebased long-term stable fertilizer (26-10-12), should be selected in corn season. Compound slow-release BB fertilizer3 or 4, namely slow-release mixed fertilizer containing humic acid (24-15-6)+heavy calcium+potassium chloride and compound fertilizer (30-0-5) or long-term ecological fertilizer containing urea coated with plant oil (25-13-7), DAP+ heavy calcium+ potassium chloride and compound fertilizer (30-0-5), should be selected in wheat season, They can be used as mechanically applied fertilizers.