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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 to 20 kg, and the targeted wheat yield per mu in the Jianghuai region is controlled at 13 to 17 kg per mu. The target area of ​​wheat is about 350 kg of mu per mu, and the amount of pure nitrogen per mu 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 the use of nitrogen fertilizer. 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 P and K fertilizers and micro-fertilizers The soil with high P content in soil should be controlled within 2 kg per mu (P 2 O 5 ), 2 to 4 kg for effective P, and 6 kg below the level of available P. Potassium with high effective potassium content may not be treated with chemical potash fertilizer, potassium content (potassium oxide) per acre with a medium content of 3~5kg, and potassium content per acre with a low content should not exceed 6kg. 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 is 5:5; for middle-gluten wheat is 6:4, jointing and panicle-fertilizer is applied in the inverted 3-leaf and inverted 2-leaf stage; weak gluten wheat is 7:3 and jointing and panicle-booting panicle-fertilizer. Should be applied in the inverted 3-leaf stage.
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.