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.