How to produce high-yield corn

Corn top dressing is a supplement to the nutrients needed during the corn growing season and is a necessary guarantee for realizing the high quality and high yield of corn.

First, the law of maize needs fertilizer

1. The absorption of nitrogen by corn is relatively stable, the male silking stage reaches a peak, the absorption rate at the mature phase of grout slows down, and nitrogen fertilizer is absorbed throughout the growth period.

2. Phosphate fertilizers are absorbed during the whole growth period of corn, and it is also at the peak of growth and development. The absorption of phosphorus in the later stage reaches a peak, but the phosphorus absorption in the later period is still about 1/3.

The absorption of potassium by maize was the most from jointing stage to booting stage, the highest flowering stage, and the absorption of potassium was stopped afterwards. On the contrary, potassium decreased in vitro due to extravasation of potassium.

Second, corn top dressing time, quantity, method

Grasping the time, method and quantity of topdressing and topdressing different kinds of fertilizers according to the conditions of the shortage of fertilizers are the main factors affecting the yield of corn. Therefore, in order to increase the unit yield of corn and achieve high yields, it is very important to grasp the best top dressing time and the amount and type of fertilizer.

1. Topdressing Topdressing should be done when about 10 leaves of corn, which can promote spikelet differentiation. It is advisable to top-dress 2 times, and if you are busy, you can also top-dress in early July.

2. The amount of topdressing should be determined according to the law of sucking fertilizer, the level of yield, the basis of soil fertility, the application of base fertilizer and seed fertilizer. High-yielding fields, good ground conditions, and a large amount of basal fertilizers should adopt the top-dressing method of lightly catching Miaofei, reclaiming panicle fertilizer and supplementing the recovery of grain fertilizer. The amount of seedling fertilizer accounted for about 30% of the total topdressing nitrogen, about 50% for panicle fertilizer, and about 20% for pellet fertilizer. The secondary cropping field, better soil fertility base, and larger amount of basal fertilization should adopt the secondary fertilizer application method of applying sufficient seedling fertilizer and reclaiming panicle fertilizer, about 4% of seedling fertilizer and about 30% of panicle fertilizer. Low-yield fields, poor fertility foundation, and a small amount of basal fertilizer use top-dressing Miaofei and light-recovery panicle-fertilizer. The Miaofei accounted for about 60%, and panicles accounted for about 40%.

3. Top dressing method Miao Fei: Generally, it will be applied from tilling to jointing stage (30% leaf age index). The imminent extraction of young shoots and jointing fertilizers are once applied, which has the effect of promoting roots, strong seedlings, and promoting leaves and strong stalks, laying the foundation for many panicles and spikes. In addition to the application of quick-acting nitrogen fertilizers, the seedlings may also be applied with both phosphate and potash fertilizers, as well as applied organic fertilizers.

Jointing fertilizer: jointing fertilizer can promote the enlargement of the middle and upper leaves, increase the photosynthetic area, extend the photosynthesis of the lower leaves, and lay a good foundation for root promotion, strong stalk growth and propagation. Top-dressing joint-fertilizer is dominated by nitrogen fertilizer, and 10~15 kilograms of urea ditches can be applied per acre or acupuncture points can be applied to avoid topdressing before heavy rain to prevent leaching by rainwater. For fields with insufficient phosphorus and potassium fertilizers in the soil, three-element compound fertilizers can also be added to topdressing at 7.5 to 10 kg per mu.

Panicle Fertilizer: In the big bell-mouth stage, corn is topped with panicle fertilizer, which can not only meet the nutrient requirement for panicle differentiation, but also improve the photosynthetic productivity of the middle and upper leaves, make more nutrients transferred into the ear, more grains and plump, and pan-fertilizer topdressing. With quick-acting nitrogen fertilizers, it is advisable to apply 15-20 kg of urea per acre.

Granular fertilizer: refers to the top-dressing fertilizers after corn tasseling, generally suitable for topdressing during the filling period. After the tasselling of corn, it takes up about 40% of the total nitrogen and phosphorus from the soil. At the same time, about 80% of the grain yield is based on photosynthetic yields produced by later leaves. Therefore, a certain amount of fast-acting fertilizers should generally be applied in the later period to ensure adequate supply of inorganic nutrients, extend the leaf functional period, increase the photosynthetic efficiency, increase the accumulation of photosynthetic products, and promote graininess and grain weight so as to obtain high quality and high yield.

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