Corn needs to absorb more nutrients in its lifetime, mainly including nitrogen, phosphorus, potassium, sulfur, calcium, magnesium, zinc, copper, boron, molybdenum, etc., among which nitrogen is most needed, followed by phosphorus and potassium, within a certain range. The yield fluctuates with the amount of nitrogen applied. Nitrogen can promote the growth of vegetative organs, increase the photosynthetic strength, extend the functional period of the leaves, and help to promote the attack of the ear. Phosphorus contributes to root development, promotes the transport of photosynthetic products, increases grain weight and improves quality. Potassium can promote the synthesis and transportation of carbohydrates and improve the resistance to lodging. Fertilization of corn should be based on base fertilizer and supplemented by topdressing; organic fertilizer is the main factor, supplemented by chemical fertilizer; nitrogen fertilizer is the main fertilizer in the topdressing, supplemented by phosphorus and potassium fertilizer. In high-yield fields, the fertilizer should be light, the joint fertilizer should be stable, the panicle fertilizer should be heavy, and the grain fertilizer should be supplemented. If the base fertilizer is insufficient, the previous fertilizer (seed fertilizer and jointing fertilizer) is the main one, and the ear fertilizer is supplemented. In the seedling stage, the field is good, and the top dressing can be light and heavy, and vice versa. In the field of different fertility fields, it is necessary to pay attention to balanced fertilization. For fields that have not been fertilized or fertilized for many years, it is especially important to apply high-quality farmyard manure or compound fertilizer mixed with a small amount of nitrogen and phosphate fertilizers, and apply the base fertilizer as a base fertilizer to ensure a balanced yield increase. The base fertilizer is generally mixed with soil and fertilizer, and the organic fertilizer is applied 1000-3000Kg per mu, combined with one-time application of phosphorus, potassium fertilizer and a small amount of quick-acting nitrogen fertilizer. In this way, it can not only ensure the fertilizer in the corn seedling stage, but also continuously supply fertilizer during the whole growth period. It is beneficial to improve soil fertility; when the seedlings are in the 4-5 leaves, the combination is between the seedlings and the seedlings. Generally, about 500Kg of manure is used to store manure with water or 5-7Kg of ammonium sulfate to achieve the purpose of Miaoqi Miaoyun; When the growth cone of the ear is elongated, the application of BB fertilizer is 5-10Kg. The jointing fertilizer can promote the development of the middle and lower leaves, and the stalk is thick and strong, and the large ear is strong. The ear fertilizer is the period when the corn needs the most fertilizer. If the supply of panicle fertilizer is insufficient, the plant is thin, the empty rod is increased, and the small amount of spikes is small, which has a great influence on the yield. Therefore, a quick-acting fertilizer should be applied to the large bell mouth of the corn, and the BB fertilizer is applied 10-15Kg+ viable pluripotency. 100g; granular fertilizer refers to the initial stage of silking, a top dressing before and after pollination, generally only used for spring corn, 5-40Kg of ammonium sulfate.
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