From the
fertilizer dosage, the specific amount of various fertilizers for the bottom of the fertilizer can be determined with reference to the results of local field fertility trials for many years and the target yield and other comprehensive factors, generally about 30% of the total amount of nitrogen fertilizer on high fertility soils for bottom application, medium and low fertility soils have 50% - 70% of the nitrogen fertilizer as a bottom fertilizer, while phosphorus, potash and micronutrients as far as possible all at once bottom application.
From the fertilizer species, nitrogen fertilizer in the ammonium carbon, phosphorus fertilizer in the general calcium, diammonium, calcium and magnesium phosphate, three materials, potash in potassium chloride, potassium sulfate, grass ash, microfertilizer in the zinc fertilizer, manganese fertilizer, etc., are suitable for the bottom fertilizer. In terms of depth, the general base fertilizer should be applied to the entire tillage layer, that is, 15-20 cm depth. For organic fertilizer, nitrogen fertilizer, potassium fertilizer, microfertilizer, can be mixed and evenly scattered on the surface, followed by plowing into the soil, so that the fertilizer and the whole tillage layer of soil evenly mixed. Phosphorus fertilizer due to poor mobility, in the bottom application should be applied in two layers, that is, the lower layer to a depth of 15-20 cm, the upper layer to a depth of about 5 cm.