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First, the law of corn fertilizer
1. The nitrogen uptake of corn is relatively stable, the peak of silking and silking reaches a peak, the absorption speed of the filling stage is slowed down, and nitrogen fertilizer is absorbed throughout the growth period.
2. During the whole growth period of corn, the phosphate fertilizer is absorbed. It is also the peak in the most vigorous growth and development period, and the phosphorus absorption in the later stage is decreased, but it still accounts for about 1/3.
3. The absorption of potassium by corn is the highest from jointing to booting stage, and the flowering stage is the highest. After stopping the absorption of potassium, potassium is reduced in vitro due to potassium extravasation.
Second, corn topdressing time, quantity, method Mastering the time, method, quantity of topdressing and the application of different types of fertilizer according to the lack of conditions are several major factors affecting corn yield. Therefore, in order to increase corn yield and achieve high yield, it is very important to master the best topdressing time and the amount and type of fertilizer.
1. Topdressing time Top dressing should be carried out around 10 leaves of corn, which can promote spikelet differentiation. It is advisable to apply fertilizer twice. If you are too busy, you can also topdress once in early July.
2. The amount of top dressing should be determined according to the law of corn absorption, the level of yield, the foundation of soil, the application of base fertilizer and seed fertilizer. High-yielding fields, good foundations and a large number of base fertilizers should be applied by light-seeking seedlings, heavy-seeking ear-fertilizers and top-dressing fertilizers. The amount of seedling fertilizer accounts for about 30% of the total nitrogen uptake, the ear fertilizer accounts for about 50%, and the grain fertilizer accounts for about 20%. For the middle-yielding field, the foundation of soil fertility is better, and the amount of base fertilizer is more, the secondary topdressing method of applying the seedling fertilizer and the heavy-seeking fertilizer should be adopted. The seedling fertilizer accounts for about 4%, and the ear fertilizer accounts for about 30%. Low-yielding fields, poor foundations and low amount of base fertilizers use the topdressing method of heavy-seeking seedlings and light-seeking fertilizers. The seedling fertilizer accounts for about 60%, and the ear fertilizer accounts for about 40%.
3. Topdressing method Miaofei: Generally, after the seedling is fixed to the jointing stage (about 30% of the leaf age index). The imminently introduced seedling fertilizer and jointing fertilizer are combined for one application, which has the functions of promoting roots, strong seedlings and promoting leaves and strong stalks, laying a good foundation for the ear and the ear. In addition to the application of quick-acting nitrogen fertilizer, the seedling fertilizer can also be applied with phosphate fertilizer and potassium fertilizer at the same time, or can also be applied with decomposed organic fertilizer.
Jointing fertilizer: jointing fertilizer can promote the increase of middle and upper leaves, increase the photosynthetic area, prolong the photosynthesis of the lower leaves, and lay a good foundation for promoting roots, strong stalks and increasing ears. The top-loading fertilizer is mainly based on nitrogen fertilizer. It can be applied with 10~15kg urea ditch or acupoint per acre to avoid the application before heavy rain to prevent it from being leached by rain. For fields with insufficient phosphorus and potassium fertilizer in the soil, three-element compound fertilizer can also be blended when topdressing, 7.5~10 kg per mu.
Spike fertilizer: The corn is applied to the panicle fertilizer during the big trumpet period, which can meet the nutrient requirements of panicle differentiation, and can increase the photosynthetic productivity of the middle and upper leaves, so that the nutrients fed into the ear are more, the grains are more and full, and the panicle fertilizer is applied. It is mainly based on quick-acting nitrogen fertilizer, and it is suitable to apply 15~20 kg of urea per acre.
Granular fertilizer: refers to the fertilizer applied after the corn is plucked, generally in the filling period is appropriate. After the corn is taken from the male to the mature stage, about 40% of the total nitrogen and phosphorus nutrients are absorbed from the soil. At the same time, about 80% of the grain yield is the photosynthetic yield produced by the later leaves. Therefore, in the later stage, a certain amount of quick-acting fertilizer should be applied to ensure the sufficient supply of inorganic nutrients, extend the functional period of the leaves, increase the photosynthetic efficiency, increase the accumulation of photosynthetic products, and promote the grain and grain weight to obtain high quality and high yield.
How to produce high-yield corn
Corn topdressing is a supplement to the nutrient needs of corn growing season and is a necessary guarantee for achieving high quality and high yield of corn.
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