The amount of fertilizer required by maize and the effect of fertilization on yield increase depend on the soil fertility level, yield level, variety characteristics, planting density, ecological environment, fertilizer type, ratio, and fertilization techniques. The total amount of nitrogen, phosphorus, and potassium absorbed by corn increased with the increase of the yield level. In most cases, the main nutrient absorbed by corn during its lifetime is nitrogen, followed by potassium and phosphorus. Under normal normal production conditions, 10-15 kg of diammonium phosphate, 15-25 kg of urea, 7-10 kg of potassium chloride or potassium sulfate can be applied per acre, and a compound fertilizer with a considerable amount of nutrients can also be selected. The best plan can be determined with reference to the guidance of soil testing formula.
Fertilization precautions:
1. Both organic fertilizer and chemical fertilizer are equal. The application of organic fertilizers can not only provide nutrients continuously, but also be an important measure to improve soil quality. Therefore, organic fertilizers should be promoted wherever possible. After applying the organic fertilizer, the amount of fertilizer may be reduced as appropriate.
2. Nitrogen fertilizer generally adopts the principle of pre-control, medium-accelerated, and post-supply, that is, the basic fertilizer is applied lightly, the big bell mouth is reapplied, and the silking and blooming period is supplemented. Phosphorus and potassium fertilizers are generally used as base fertilizers. The base fertilizer can be applied in combination with the spring soil preparation. Spring maize seedlings at low temperature, promote the application of appropriate phosphate fertilizer (diammonium phosphate) or compound fertilizer as a seed fertilizer.
3, the role of trace elements can not be ignored. Observe the principle of crop manure requirements and soil nutrient deficiency. Take the principle of lack of supplements for medium and trace elements. Some plots may be deficient in zinc or lack of boron. It is recommended to determine whether micronutrients are required depending on the soil test conditions.
4. The application amount and application method of fertilizer should be reasonable. According to the maize production target and soil fertility level, soil testing and formula fertilization were conducted, and formulas and special fertilizers formulated for soil testing were used at all levels of soil and fertilizer stations. Due to the long growth period of corn, if the "one shelled bombardment" fertilization method is likely to cause prolonged growth in the early stage, defertilization of the later plants, and premature senescence, it is recommended to carry out a topdressing at the jointing stage or large mouth period, and nitrogen and phosphorus available fertilizers should be used for top dressing. the Lord.
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