The amount of organic fertilizer is small, excessive nitrogen application is common and the proportion of pre-application is too large, and trace elements are lacking.
(2) Fertilization principles
1. Add organic fertilizer, implement straw returning, and combine organic and inorganic;
2. Appropriately reduce the total amount of nitrogen fertilizer, adjust the proportion of base fertilizer and top dressing, and reduce the amount of base fertilizer;
3. Phosphorus-deficient soil should be properly applied with phosphate fertilizer or stabilized application of phosphate fertilizer. The soil with high phosphorus content can appropriately reduce the amount of phosphate fertilizer;
4, the priority is to choose medium and low concentration fertilizer varieties, phosphate fertilizer can choose calcium magnesium phosphate fertilizer and superphosphate, potassium fertilizer can choose potassium chloride.
(3) Fertilization advice
1. Under the condition of more than 400 kg per mu: nitrogen fertilizer (N) 12-14 kg/mu, phosphate fertilizer (P2O5) 4-6 kg/mu, potash fertilizer (K2O) 4-6 kg/mu;
2. Under the condition of 300-400 kg per mu: nitrogen fertilizer (N) 10-13 kg/mu, phosphate fertilizer (P2O5) 3-5 kg/mu, potassium fertilizer (K2O) 3-5 kg/mu;
3. Under the condition of 200-300 kg per mu: nitrogen fertilizer (N) 8-11 kg/mu, phosphate fertilizer (P2O5) 3-5 kg/mu, potassium fertilizer (K2O) 0-5 kg/mu.
Fertilizer operation: 50% of nitrogen fertilizer is used as base fertilizer, 50% is used as top dressing; phosphorus and potassium fertilizer are all used as base fertilizer. Weak gluten wheat should increase the proportion of base fertilizer. In the areas of zinc deficiency and manganese deficiency, 1 kg of zinc sulfate or manganese sulfate is applied per mu, and the molybdenum field is seeded with ammonium molybdate. Appropriate reduction of the amount of base fertilizer can be appropriately reduced by applying organic fertilizer or planting green manure. In the plots where the straw is returned to the field, the amount of potassium fertilizer can be appropriately reduced.
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