To increase the application of organic fertilizer in the rice-wheat rotation area, it is necessary to actively promote the return of various forms of straw to the field. The amount of straw returned per mu shall be at least 150 kg, and the full or half amount of rice straw shall be returned to the conditions. Huaibei region should give full play to the advantages of labor force and build a fine tradition of applying farmyard manure, increase the application of high-quality organic fertilizer, and use about 1,000 kilograms per mu. Other areas should vigorously promote the use of commercial organic fertilizer, the amount of 150-200 kg per mu. Controlling the amount of nitrogen fertilizer When the target wheat yield exceeds 450 kg per mu in the Huaibei region, the amount of pure nitrogen per mu is controlled at 17-20 kg, and the wheat target in the Jianghuai region is about 400 kg per mu. The amount of pure nitrogen is controlled at 13-17 kg per mu. The wheat target area of ​​about 350 kg per mu when the amount of pure nitrogen is controlled at 12-15 kg. In the field where the straw is fully returned to the field, the available nitrogen fertilizer may be appropriately increased in the early stage. Weak-gluten wheat panicle fertilizer should control nitrogen fertilizer application. Areas where farm manures or commercial organic fertilizers are used should be used to reduce the amount of chemical nitrogen fertilizers as appropriate. Rational application of phosphorus and potash fertilizers and fertilizers with high phosphorus content in soils with high phosphorus content per mu control the amount of phosphorus (phosphorus pentoxide) within 2 kg, the effective control of phosphorus in the 2-4 kg, the amount of available phosphorus is not more than 6 kg. Potassium with high effective potassium content may not be treated with chemical potash fertilizer, potassium content (potassium oxide) of 3-5 kg ​​per mus for medium content, and potassium content per mus for lower content of potassium may not exceed 6 kg. Timely and reasonable application of manganese, iron, zinc and other trace element fertilizers. One-time application of fertilizer for phosphate fertilizer in scientific management. Potash fertilizer and panicle fertilizer application each accounted for half. Nitrogen fertilizer is applied in stages. The ratio of nitrogen-based fertilizer to jointing and booting for strong gluten wheat was 5:5; for middle-gluten wheat, 6:4, jointing and panicle-fertilizing were applied in the inverted 3-leaf and inverted 2-leaf; weak-gluten wheat was 7:3; It is applied in the inverted 3-leaf stage.
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