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Rice emphasizes balanced fertilization [Date: 2005-09-14] Author: Ningxia Agricultural Technology Extension Station of balanced fertilization to master to earth ability to produce nitrogen determination, due to lack of fill a vacancy, the combination of organic and inorganic, Balanced Fertilization with the principle of . On the basis of soil testing, according to soil characteristics, climate characteristics, cultivation habits, production levels and other conditions, determine the target yield, put forward the most suitable amount of nitrogen fertilizer and the best ratio of nitrogen, phosphorus and potassium. Every 100 kg of rice needs to absorb 2.0-2.4 kg of nitrogen, 0.9-1.4 kg of phosphorus pentoxide, 2.5-3.8 kg of potassium oxide, and the ratio of nitrogen, phosphorus and potassium is about 1:0.5:1.3. 400-500 kg of rice per mu operating procedures are as follows: 1, the amount of organic fertilizer: organic fertilizer accounted for about 50% of the total amount of fertilizer, so to re-apply organic fertilizer. Early rice applies 1,500-2,500 kilograms of fresh green manure or 1,000-1,500 kilograms of manure or 60-80 kilograms of commodity organic fertilizer per acre. Late rice also returns 200-250 kilograms of dry straw or 1,000-1,500 kilograms of manure or 80-100 kilograms of organic fertilizer. . 2. The ratio of NPK: The rice yield is 400-500 kilograms per mu, requiring a total of 10-12 kilograms of pure nitrogen, 4.5-5.5 kilograms of phosphorus pentoxide, 13-16 kilograms of potassium oxide, and a ratio of nitrogen, phosphorus, and potassium 1∶0.4∶1.3. 3. Fertilizer type selection: choose high-quality and high-efficiency urea, ammonium bicarbonate, calcium, magnesium, phosphorus or superphosphate; potassium sulfate or potassium chloride and other simple fertilizer or rice-specific fertilizer, compound fertilizer. 4. Application period: 1) Base fertilizer: organic fertilizer and phosphate fertilizer are all used as base fertilizer, and organic fertilizer is applied before plowing. When Putian applies per acre, 35 to 40 kg of calcium, magnesium phosphate fertilizer and 15 to 20 kg of ammonium bicarbonate, 8 to 10 kg of potassium sulfate, or 6 to 8 kg of potassium chloride. 2) Dressing: Top dressing should be divided into two applications. The first top dressing should be applied about 7 days after transplanting. Urea urea 7.5-9 kg, potassium sulfate 6-7.5 kg or potassium chloride 5-6 kg; The top dressing is applied about 15 days after transplanting, with urea 8-10 kg per mu, potassium sulfate 10-12 kg, or potassium chloride 8-10 kg. 3) Panicle fertilizer: Young panicle differentiation period (about 25 days after transplanting early rice, 50 days after transplanting late rice). If the leaf color turns yellow, apply urea 2-2.5 kg and potassium fertilizer 3-4 kg per acre. 4) Spray foliar fertilizer: spraying potassium dihydrogen phosphate or rice leaf foliar at the booting stage and mature stage.