I. Potassium chloride
1, potassium chloride is mainly made of carnallite, potassium salt and brine, which contains 50-60% potassium oxide.
2. Potassium chloride is soluble in water, the solubility is about 34.7% at 20℃ and 55.7% at 100℃.
3. Potassium chloride is a quick-acting fertilizer, which is often used as base fertilizer and topdressing, and can be directly absorbed by plants.
4. Potassium chloride has small hygroscopicity, generally does not agglomerate, good physical properties and convenient application.
5, potassium chloride in storage, should be placed in a cool, ventilated warehouse, need to be stored separately from oxidant, also need to be stored away from fire and heat sources.
Second, potassium sulfate.
1, pure potassium sulfate is mostly rhombic or hexagonal crystal, and its color is mostly white or light yellow.
2. About 70% of potassium sulfate produced in the world is converted from potassium chloride, and some of it is directly made from natural minerals and hard salt ores.
3. Potassium sulfate is a water-soluble potash fertilizer, containing 50-52% potassium and about 65,438+08% sulfur. Low hygroscopicity, difficult caking and good physical properties.
4. Potassium sulfate is suitable for all kinds of soils and crops, especially for cash crops that avoid chlorine and prefer potassium, such as tobacco, grapes and sugar beets.
Three. potassium nitrate
1, potassium nitrate is mostly colorless and transparent rhombic crystals, or white powder, tasteless and nontoxic, with salty taste.
2. Potassium nitrate is a neutral fertilizer, containing about 46% potassium and 3.5% nitrate nitrogen/kloc-0, with good water solubility.
3. Potassium nitrate is mostly used as topdressing, which can be applied to vegetables, fruits, flowers and some crops sensitive to chlorine, such as potatoes, strawberries, beans, Chinese cabbage and apricots.