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Second, the steady application of joint fertilizer: jointing fertilizer has the effect of promoting leaf stalks. Generally, organic fertilizer should be used, and 5 kg of urea or 15 kg of ammonium bicarbonate should be blended. Ditching is applied to 7-9 leaves of corn.
Third, heavy application of panicle fertilizer: corn big bell mouth period is in the vegetative growth and reproductive growth and advancement, growth is strong, requiring a large amount of fertilizer. Fertilization in this period has the effect of promoting large and large grains. It can not only meet the requirements of ear differentiation for nutrients, but also improve the photosynthesis rate of middle and upper leaves, so that nutrients can be transported to the ears. Generally, it is applied at a distance of 20 cm from the plant 7-10 days before the tasseling. 50 kg of ammonium bicarbonate is applied per mu.
Fourth, skillful application of granular fertilizer: granular fertilizer has the effect of preventing premature aging and increasing grain weight. It can prolong the functional period of green leaves, increase the efficiency of photosynthesis, increase the accumulation of photosynthetic products, and increase the weight of grains. When the ears are spun, the ditch is applied. Generally, 5 kg of ammonium bicarbonate is applied.
5. Foliar spray fertilizer: Spraying phosphate fertilizer on the foliage during corn filling stage has a significant effect on promoting nutrient transport to grain and increasing 1000-grain weight. Generally, 0.4%-0.5% potassium dihydrogen phosphate aqueous solution or 3% nitrogen-phosphorus mixed solution is sprayed on the stems and leaves with about 75-100 kg per acre, and the effect is remarkable.
Huaxian County Shang Hongyan
First, light application of seedling fertilizer: seedling stage fertilization has the effect of promoting roots and strong seedlings, laying the foundation for the late high yield. Generally, the seedlings are applied to the leaves of the plants at a distance of 10-12 cm from the 4 leaves of the corn, and the ammonia is 7.5 kg. In addition to the application of quick-acting nitrogen fertilizer, phosphate fertilizer and potassium fertilizer can be applied at the same time.
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