The three elements of nitrogen, phosphorus, and potassium are large quantities of rice, which can not meet the needs of rice growth and development only by soil supply, and must be applied separately. Balanced fertilization must grasp the principles of determining production by soil and nitrogen, due to the lack of supplement, organic and inorganic combination, and the principle of balanced application of nitrogen, phosphorus and potassium.

The operating rules for rice production of 400-500 kg per mu are as follows:

1. The amount of organic fertilizer; the amount of organic fertilizer accounts for about 50% of the total fertilizer, so it is necessary to reapply the organic fertilizer. Generally, 1500-2500 kg of rotted farm manure or 80-100 kg of commercial organic fertilizer should be applied to organic mu. It is best to apply organic biological bacterial fertilizer, which contains enzyme bacteria, EM bacteria and Bacillus subtilis.

2. The proportion of nitrogen, phosphorus and potassium; the amount of pure nitrogen required for rice per mu of about 450 kg is 10 to 12 kg, the phosphorus pentoxide is 4.5 to 5.5 kg, and the potassium oxide is 13 to 16 kg. The ratio of nitrogen, phosphorus and potassium is 1: 0.4: 1.3.

3. The selection of fertilizers, choose high-quality and high-efficiency urea, ammonium sulfate, carbon ammonia, calcium magnesium phosphate fertilizer, calcium superphosphate potassium chloride and potassium sulfate, should be applied every other year to prevent chlorine or sulfur deficiency.

4. The application of silicon-zinc fertilizer is necessary to prevent stalks from lodging and enhance photosynthesis.

5. The principle of rice fertilization, under the premise of applying sufficient organic fertilizer, stabilize nitrogen, reduce phosphorus, increase potassium and supplement micro-enrichment.

6. As long as the method of fertilization and principles of fertilization are adopted in this way, the maturity of rice grains can be promoted, the rice yield and the quality of rice can be improved, and the yield and income can be increased.

Special fertilizer for rice

25-10-16, 25-10-18, 24-6-10, 24-6-16 (high tower process)

18-12-10, 20-13-10, 18-18-18 (drum humic acid process)

15-15-15, 16-16-16, 17-17-17, 18-18-18, 22-8-10 (ammoniation process) fertilizer for rice planting is generally formulated with potassium content of about 10 and nitrogen content of about 20. Nitrogen in the formula is not enough and can supplement nitrogen elements.