1, the basic principles of fertilization. Nitrogen, phosphorus, potassium and trace elements were applied in combination with balanced fertilization; nitrogen fertilizer was applied deep, fertilizer was applied in stages; water and fertilizer were combined to increase fertilizer efficiency.
2, determine the amount of fertilizer. It should be based on a variety of factors such as the law of sucking fertilizer, the yield level, soil fertility, fertilizer nutrient content and utilization.
3, the application of basal fertilizer. The fertilizer applied before sowing is called base fertilizer. Its role is "to manure soil, with soil fertilizer seedlings." Generally, organic fertilizer, part of nitrogen fertilizer, and total phosphorus and potassium fertilizer (for more absorption in the early period, long-term fertilizer effect), micro-fertilizer (each with 1 kg of zinc, molybdenum, and boron fertilizer) are mixed and concentrated. If it is too late to use, it can also be used once for seedlings.
4, application of fertilizer. When sowing, the fertilizer applied next to the seed or along with the seed is a seed fertilizer. It can meet the needs of nutrients at the early stage of corn growth and has the effect of promoting the development of roots and the growth of seedlings. Generally, the use of diammonium phosphate or 3 kg of urea per acre should be done to separate the fertilizer and the seed and prevent injury.
5. Top dressing application. Fertilizer applied during the growth period of corn is called topdressing. The frequency and quantity of top-dressing period should be comprehensively considered and decided according to the law of sucking fertilizer, the yield level, the basis of soil fertility, and the amount of fertilization. (1) Dressing time and role. 1 Miao Fei (climbing stalk manure), generally after the fixed seedlings before the jointing, can be combined with the drawing fertilizer and jointing fertilizer for one application. It has a role in promoting roots, strong seedlings, and promoting leaves and strong stalks, laying a good foundation for ear and spike. 2 Panicle fertilizer (crop fertilizer), applied during the big bell-mouth period of corn, requires the most fertilizer during this period, and is the key period for determining the size of the ear and the number of grains. It can promote large spikes and grains. 3 grain fertilizers (aggravating fertilizer), usually from the tasseling to the flowering stage. It can ensure the full supply of inorganic nutrients, extend the functional period of green leaves, increase the accumulation of photosynthetic products, and promote the production of more grain and grain weight to achieve higher yields. (2) nitrogen fertilizer classification and implementation plan. 1 high-yield fields, good ground and fertilization quantity, it is best to use light harvest Miao Fei, heavy panicle fertilizer, make up the recovery of grain fertilizer three attack top dressing method. The seedling use accounted for about 30% of the total topdressing nitrogen, about 50% for panicle fertilizer, and about 20% for pellet fertilizer. 2 The middle-quality field has better soil fertility and more top dressing. It is recommended to use the secondary dressing fertilizer with full-grown seedlings and heavy panicle fertilizer. The seedlings account for about 40% of the total nitrogen, and panicle fertilizer accounts for about 60%. 3 low-yield fields, poor fertility, less topdressing, it is appropriate to use renewed Miao Fei, light rear panicle fertilizer approach, Miaofei accounted for about 60%, accounting for about 40% of the period. (3) nitrogen fertilizer method. Appropriate depth of about 10cm is suitable, and the seedling fertilizer is 10-12cm away from the plant, panicle fertilizer and grain fertilizer are 15-20cm from the plant. In this way, the fertilizer effect can be fully utilized and the nitrogen fertilizer utilization rate can be increased.
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