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The Categories Properties And Application Of NPK Compound Fertilizer (Two)

 The Categories Properties And Application Of Potassium dihydrogen phosphate,Potassium nitrate compound fertilizer.
3. Potassium dihydrogen phosphate
  Potassium dihydrogen phosphate is a high concentration of phosphorus and potassium binary compound fertilizer, pure white or off-white crystal, nutrients for 0-52-34,  less hygroscopic, good physical properties, soluble in water, aqueous solution ph3-4, expensive.

  Potassium dihydrogen phosphate is suitable for seed soaking, seed dressing and top dressing. The soaking concentration was 0.2%, and the time was 12 hours. The soybean and wheat were soaked in 30kg and 50kg of each 100kg solution. Seed dressing is usually applied with 1% concentration spray, and seed dressing is applied on the same day. The spraying concentration was 0.2%-0.5%, and 50kg-75kg liquid was used every 667m2. It was selected in the afternoon of sunny days to spray the foliar surface to the ground without dropping. Wheat at the jointing booting stage and cotton before and after flowering were sprayed three times. Spraying 0.5% potassium dihydrogen phosphate solution on the fruit during the period of fruit enlargement to color has a good effect on improving the product quality.
4. Potassium nitrate
  Potassium nitrate is commonly known as pyronitrate. It is made of sodium nitrate and potassium chloride together and then recrystallized or extracted from nitrosols. Its molecular formula is KNO3.Contains N13%, K2O46%. Pure potassium nitrate is white crystal, coarse products slightly yellow, hygroscopic, soluble in water, for chemical neutral, physiological neutral fertilizer. It is easy to explode under high temperature and belongs to inflammable and explosive substances.
  It is Suitable for dry land , generally 5 ㎏  - 10 ㎏ / 667 m2, for those potato, tobacco, sugar beet, grapes, sweet potato crops such as prefer potassium to chlorine cream has good effectiveness, the reaction is good in legume crops, such as used for other crops should cooperate with elemental nitrogen fertilizer to improve fertilizer effect. Potassium nitrate can also be used as root topdressing, with an appropriate concentration of 0.6%-1%. In dry area, it can also be applied in combination with organic fertilizer, with a dosage of about 10kg/667m2.
  Since the N: K2O of potassium nitrate is 1:3.5, the content of potassium is high, so the calculation of fertilizer should be based on the content of potassium.