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The life of summer corn can be divided into seedling stage, ear part and flowering stage. The seedling stage is dominated by vegetative growth of rooted and long leaves. The ear stage refers to the period of vegetative growth and reproductive growth from jointing to heading, and the key is to breed the size of the ear. The flowering stage is extracted from the tassel to the stage of grouting to mature maize reproductive growth, mainly the formation of yield. Summer corn absorbs nutrient nitrogen in its lifetime: phosphorus: potassium ratio is 1:0.48:1.35, and it needs to absorb 2.5 kg of pure nitrogen, 1.25 kg of pure phosphorus and 3.5 kg of pure potassium for every 100 kg of grain. The absorption of NPK in different growth stages of maize was different, the seedling stage was less, the jointing stage increased significantly, and the booting stage reached the peak and then gradually decreased. The nutrient critical period of phosphorus is in the seedling stage and early jointing stage. The nutrient critical period of potassium is in the flowering stage, and the summer maize absorbs nitrogen earlier, and the jointing and booting stage accounts for 76% of the total.
Most of the North China region is deficient in phosphorus. Although potassium is abundant, but the demand for corn is large, it is necessary to increase the application of potassium fertilizer. The rational fertilization rule of summer maize is nitrogen > phosphorus > potassium, and the application of pure nitrogen per mu is between 12-15 kg. The compound fertilizer with nitrogen-phosphorus compound, nitrogen-potassium compound or nitrogen-phosphorus-potassium combination is used as top dressing, which is more effective than single-fertilizer application alone. The formula has 28:8 of 36% content of nitrogen and potassium fertilizer, mono-ammonium, di-ammonium or 28:6. : 6% of 40% NPK compound fertilizer, 40 kg per mu, topdressing generally adopts "pre-weight and light" fertilization method, and two-thirds of the total amount of topdressing is applied before jointing (25 days after sowing) Left and right), the large trumpet period (40-45 days after sowing) is applied to the remaining one-third. During the filling period, it depends on the growth of the plant to determine whether it is fertilized. If the plant has premature aging and fattening, it must be applied. 10 kg of urea, no premature aging, no fattening, no fertilization to prevent late maturity.
Author: Henan Feng Seed Industry Guo Jun super slide
Summer corn fertilization technology
Most of the summer corn is made up of two-year-old wheat-maize rotation system, and the wheat is interplanted or the wheat is harvested after the wheat is harvested. The main producing areas of summer maize are in North China, and the growing period of the cultivated varieties is about 100.
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