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How To Make Good Use Of Potassium Dihydrogen Phosphate During The Growth And Development Of Corn?

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Corn is a crop that requires more fertilizer and more concentrated absorption

1. From seedling to jointing, corn absorbs little nutrients, generally about 2.5% nitrogen, 1.12% available phosphorus, and 3% available potassium;

2. The growth of maize accelerates sharply from the jointing stage to the flowering stage, which is a critical period for maize to require fertilizer. In this period, it absorbs 51.15% of nitrogen, about 63.81% of available phosphorus, and about 97% of available potassium;

The absorption of potassium by corn, spring and summer corn both increase rapidly after jointing, and reach the peak during the flowering period, the absorption rate is large, and it is easy to cause potassium deficiency and potassium deficiency symptoms.

3. The rate of absorption from flowering to maturity gradually slowed down. During this period, the absorption of nitrogen was about 46.35% and the available phosphorus was about 35.07%.

The nutrient absorption of corn varies in different growth periods. In the seedling stage, due to the small plant size and slow growth, the amount of nutrient absorption is small; from the jointing booting stage to the heading and flowering stage, the growth rate of corn increases rapidly, vegetative growth and reproductive growth go hand in hand, and the amount of fertilizer absorption increases significantly; after flowering and pollination, the absorption amount decreases.

According to the law of fertilizer absorption in each growth period of corn, and the experience of some high-yield areas, the principle of fertilization for corn is: apply sufficient base fertilizer, lightly apply seedling fertilizer, apply jointing fertilizer smartly, apply attack fertilizer again, and apply grain fertilizer as appropriate.

From the above analysis of the nutrient absorption data during the entire growth period of corn, it is completely impossible to meet the needs of the entire growth period of corn if only the base fertilizer is used. There are even many corn farmers who do not apply basal fertilizer. Therefore, it is very important to adopt top dressing from the jointing stage of corn, otherwise the corn will be severely defertilized, which may cause a serious reduction in production.

Of course, in addition to topdressing the roots of corn, we can also quickly add nutrients to the corn by spraying fertilizers on the leaves. Especially in the middle and late stages of corn growth, the roots begin to age and the ability to absorb fertilizers and water is weakened. Potassium hydrogen + urea + brassinolide is very important.


How to make good use of potassium dihydrogen phosphate during the growth and development of corn?

Potassium dihydrogen phosphate is a high-phosphorus and high-potassium binary compound fertilizer. The phosphorus and potassium nutrient content is as high as 86%. It has good water solubility and high phosphorus and potassium nutrient content, which can be quickly absorbed and utilized by crops. Therefore, potassium dihydrogen phosphate is often used by farmers as extra-root topdressing, that is, foliar spraying fertilizer. Potassium dihydrogen phosphate also has the reputation of being the best foliar fertilizer.

The use of potassium dihydrogen phosphate on corn also has a broad basis. Many farmers who grow corn are already very familiar with potassium dihydrogen phosphate. However, many farmers still have some specific methods of using potassium dihydrogen phosphate on corn. Lack, today the fertilizer Hunan Army shares with you several key periods when corn uses potassium dihydrogen phosphate.

The first critical period is in the corn seedling stage, which generally refers to between 5 leaves and 9 leaves, all of which can be sprayed with potassium dihydrogen phosphate once. Especially when you control the growth of corn, you can add high-quality phosphoric acid. Potassium dihydrogen

The second critical period is spraying during the corn bell mouth period. Generally, foliar spraying is carried out when there are 12 and 13 corn leaves. When spraying potassium dihydrogen phosphate, it is recommended that you add brassinolide and Boron can promote the development of male and female ears, increase the activity of pollen grains, increase the rate of pollination, and greatly reduce the symptoms of lack of seeds, shaggy seeds and bald tips.

During this period, spraying potassium dihydrogen phosphate can be used together with jointing fertilizer. The application of jointing fertilizer must not only continue to meet the needs of the mass growth of roots, stems, and leaves, but also ensure the supply of nutrients for the development of reproductive organs, so that vegetative growth and reproductive growth can develop in a balanced manner.


The third critical period is to spray during the corn filling period (just after blooming). At this time, the corn root system begins to age and the leaves may age prematurely. It can be sprayed together with urea and brassinolide. Promote fullness of corn kernels and prevent premature aging.

During this period, the spraying of potassium dihydrogen phosphate is mainly used in combination with Gongbao fertilizer and strong grain fertilizer. When maize has a large bell mouth, it is the period of vigorous development of maize female and male floral organs, which is a critical period that determines ear size, grain size, and pollen viability, and it is also the peak period for maize to absorb water and fertilizer.

Grain fertilizer should be determined according to the growth of corn. Insufficient fertilizer for attacking buds and more yellow leaves below the ear node. Grain fertilizer should be applied when defertilization occurs; on the contrary, no fertilizer is needed for flourishing growth. Grain fertilizer is generally applied during the silking of corn ears, with 2 to 3 kilograms of urea per 667 m2, and sprayed on water; 1% urea and 0.2% potassium dihydrogen phosphate solution can also be used for foliar spraying, which has good results.

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