Fertilizer requirements General medium-fertility plots. The amount of fertilization for rice fields with a yield of about 500 kilograms per mu is 1000-2000 kg of decomposed organic fertilizer, 8-12 kg of nitrogen fertilizer, 5-6 kg of phosphate fertilizer, 4-8 kg of potassium fertilizer, and zinc deficiency soil. Apply 1-2 kg of zinc sulfate.
The basal fertilizer is mainly organic fertilizer (including green manure) and can be applied to decomposed organic fertilizer at a dosage of 1000-2000 kilograms per acre, combined with the application of marmot; the fertilizer is applied with 12-15 kilograms of urea per acre. 30-40 kilograms of calcium phosphate, 7-12 kilograms of potassium chloride (or an equal amount of compound fertilizer) are applied to the field, and the water is applied to the whole layer of water. Potassium fertilizer use can be reduced by half in areas where straw is introduced.
Top-dressing rice topdressing is still dominated by nitrogen fertilizers. If base fertilizers have insufficient potassium, potassium fertilizers should also be topdressed. Topdressing should be done as follows: The manure is early enough, the panicles are stable, and the grains are light.
After tillering and transplanting till tillering (turning green), generally early and mid-season rice is inserted for 5 days, late rice is applied for 3 days after inserting, so that the application of fertilizer can be promoted by applying fertilizer, applying 5-7 kg of urea per acre, and applying organic fertilizer. Little and potassium-poor fields, followed by 3-5 kg ​​of potassium chloride per acre. Fields with insufficient fertilizers are applied again every 5-7 days. In addition, if basal fertilizer is not applied with zinc fertilizer, foliar spraying may be performed with 50-100 g of zinc sulfate and 0.2% aqueous solution during the tillering period.
Spike and spike fertilizer is applied in the early stage of jointing (after rehydration in the field), 2-3 kg of urea and 3-5 kg ​​of potassium chloride are applied per mu. Look at the seedlings before heading and then apply urea 2.5 kg as granular fertilizer. The application of foliar fertilizer should be paid attention to in the late period of high-yield and super-high-yield cultivation fields. For example, spraying with liquid fertilizers containing silicon and selenium can enhance the resistance of rice, early maturity, and improve the taste and nutritional quality of rice. Increase the value of goods. The foliar spraying with 0.2%-0.3% potassium dihydrogen phosphate at the heading-filling stage can prolong the survival rate of functional leaves at the later stage of growth, accelerate the grain filling rate, reduce the emptying rate, increase the grain weight, and prevent Delayed chilling also has a role.
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