Corn planting technology: how to topdressing can improve the yield of corn per mu?

How can topdressing increase the yield of corn per mu? Also ask netizens to help introduce to topdressing corn can refer to the following stages: skillful application of corn seedling fertilizer: seedling fertilizer is a fertilizer applied after corn planting. Generally speaking, when the plant has 5 or 6 visible leaves, the nutrients in the seed endosperm have been exhausted, the roots begin to absorb nutrients from the soil, and the vegetative organs of maize grow vigorously, if the nutrient supply can not keep up. It will seriously affect the growth and development of maize, and topdressing can meet the needs of growth and development and form strong seedlings. The amount of maize seedling fertilizer accounts for about 30% of the amount of topdressing nitrogen, generally from seedling setting to jointing. Lay a good foundation for large ears and more ears. The field with seed fertilizer during sowing can appropriately reduce the amount of seedling fertilizer and postpone the time of topdressing. Generally, you can top fertilizer urea 3kg / mu or ammonium bicarbonate 10kg / mu. Re-application of corn ear fertilizer: ear fertilizer refers to the topdressing of corn 10-15 days before the male ear, when the leaves are 12-13. This period is the key period to determine the ear size and grain number. During the peak period of floret differentiation of maize female spike, vegetative growth and reproductive growth went hand in hand, the absolute amount and accumulation rate of nutrients absorbed by stems, leaves and female ear reached the peak, the root system needed to absorb a large amount of nutrients from the soil, and the nutrients of various organs were quickly transported to the female ear. Topdressing ear fertilizer in time can significantly increase the yield of maize. Corn ear fertilizer generally accounts for 50%-60% of the total fertilizer application, generally 18-20 kg urea per mu or 45-50 kg ammonium bicarbonate and 3-4 kg potassium sulfate per mu. If the soil moisture is poor and there is no irrigation condition, 2% urea solution can be used as root fertilizer, and each plant can be irrigated with 80ml 100 ml. Timely application of foliar fertilizer: foliar fertilizer is generally applied at seedling stage, jointing stage and filling stage. Spraying 0.1%-0.3% zinc sulfate aqueous solution at the seedling stage can prevent the occurrence of maize white seedling mosaic disease, and spraying 0.2%-0.3% potassium dihydrogen phosphate 2 times at the jointing stage can strengthen the stalk and resist lodging and grow steadily. Grain filling stage is the key period to determine the number of grains per ear and grain weight of maize, which requires a certain amount of nutrient supply. Soil fertilization uses more fertilizer, and the effect is slow. If foliar fertilizer spraying is adopted, the effect is fast and the effect is significant. The type of fertilizer can be determined according to the growth of corn. For example, those who are deficient in nitrogen, phosphorus and potassium can be sprayed with 1.5 kilograms of urea, 100 grams of potassium dihydrogen phosphate and 50-60 kilograms of water; if there is insufficient nitrogen, phosphorus and potassium and lack of zinc, 100 grams of zinc sulfate can be added to the above solution; only nitrogen is needed. 2% urea solution can be sprayed on the leaf surface, generally 2% urea solution can be sprayed 3 times. Click to get more corn planting techniques click to get more food crop planting techniques