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NPK compound fertilizer contents

Potassium dihydrogen phosphate

Potassium dihydrogen phosphate is a kind of high concentration phosphorus potassium binary compound fertilizer, pure white or grayish white crystal, nutrient is 0-52-34, small hygroscopicity, good physical properties, soluble in water, water solution ph3-4, expensive.

Potassium dihydrogen phosphate is suitable for seed soaking, seed dressing and topdressing. The soaking concentration was 0.2% and the soaking time was 12 hours. Soybean and wheat were soaked in 30kg and 50kg solution, respectively. Seed dressing is usually sprayed with 1% concentration and seed mixed on the same day. The spraying concentration was 0.2% – 0.5%, and 50kg-75kg solution was used every 667m2. Choose to spray the leaves on the ground on a sunny afternoon without dripping. Wheat at jointing booting stage and cotton before and after flowering were sprayed three times. Spraying 0.5% potassium dihydrogen phosphate solution during fruit expansion and coloring has a good effect on improving product quality.

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Potassium nitrate is usually called pyronitrate. It is recrystallized from sodium nitrate and potassium chloride or extracted from nitroso. Its molecular formula is KNO3. It contains 13% N and 46% K2O. Pure potassium nitrate is white crystal, crude product is slightly yellow, hygroscopic, soluble in water, chemical neutral, physiological neutral fertilizer. It is easy to explode at high temperature and belongs to flammable and explosive substances.

It is suitable for dry land, generally 5-10 kg / 667 m2. It has a good effect on potato, tobacco, beet, grape, sweet potato and other crops that prefer potassium rather than chlorine frost. It has a good response in legume crops. If it is used for other crops, it should be combined with element nitrogen fertilizer to improve fertilizer efficiency. Potassium nitrate can also be used as root topdressing, and the suitable concentration is 0.6% – 1%. In arid areas, it can also be applied with organic fertilizer, the dosage is about 10kg / 667m2.
As the N: K2O ratio of potassium nitrate is 1:3.5, the content of potassium is higher, so the calculation of fertilizer should be based on the content of potassium.

3 ways to learn the organic fertilizer

1. Improve soil fertility. After applying organic fertilizer to soil, organic matter can effectively improve soil physical and chemical properties and biological characteristics, solidify soil, enhance soil fertility and buffer capacity, and create good soil conditions for crop growth.

2. Increase production and improve quality. Organic fertilizer is rich in organic matter and a variety of nutrients, providing nutrients for crops. The decomposition of organic fertilizer can provide energy and nutrients for soil microbial activities, promote microbial activities, accelerate the decomposition of organic matter, and produce active substances, which can promote crop growth and improve the quality of agricultural products.

3. Improve fertilizer utilization rate. Organic fertilizer contains many kinds of nutrients, but its relative content is low and its release is slow. However, chemical fertilizer has high nutrient content, less composition and fast release. The organic acids decomposed by organic matter can also promote the dissolution of mineral nutrients in soil and fertilizer. Organic fertilizer and chemical fertilizer promote each other, which is conducive to crop absorption and improve fertilizer utilization rate. Want to make your own organic fertilizer? Go to