The existence of potassium in crops is different from nitrogen and phosphorus. It mainly exists in the form of ionic or soluble salts or adsorbed on the surface of protoplasm, rather than in the form of organic compounds.
The main functions of potassium in crops are as follows: Potassium is the activator of many enzymes. Enzymes are catalysts in the metabolic process of crops. Without enzymes, many physiological processes cannot be carried out. Potassium can promote photosynthesis and promote the synthesis of carbohydrates. And transportation; potassium can promote the synthesis of protein; potassium can enhance the toughness of crop stalks, and enhance the ability of crops to resist lodging and diseases and insects; potassium can improve the ability of crops to resist drought and cold.
Potassium sulfate and potassium nitrate are both binary compound fertilizers. The main difference between the two is: Potassium sulfate, which is just a kind of potassium fertilizer, does not contain phosphorus and nitrogen fertilizers. To be used in conjunction with other fertilizers. Potassium nitrate is an efficient compound fertilizer containing potassium and nitrogen. It is more beneficial to apply nitrate nitrogen to chloride-sensitive crops than ammonium nitrogen, such as citrus, grapes, vegetables, sugar beets and other crops that are sensitive to chloride ions. The nitrate nitrogen in potassium nitrate can prevent crops from absorbing the chloronitrate nitrogen in the soil. It can quickly provide nutrients under any conditions. It is suitable for spring, summer, autumn and winter crops; it will not cause the accumulation of salt in the soil. Both soil and crops can achieve good results, especially suitable for chlorine-free crops, such as tobacco, tomatoes, oranges, grapes, etc.; potassium nitrate is more expensive than potassium phosphate.
Potassium sulfate is a colorless crystal with low hygroscopicity, not easy to agglomerate, good physical properties, easy to apply, and is a good water-soluble potassium fertilizer. Potassium nitrate is a chlorine-free potassium and nitrogen compound fertilizer. The total content of phytonutrient potassium and nitrogen can reach about 60%. It has good physical and chemical properties. Potassium sulfate will harden the soil, and the formed sulfate will be more insoluble. Nitrate has better water solubility.
Application of potassium nitrate in farmland has the following advantages: because it has no volatility, it can be directly applied to the soil surface without covering