The size of the fertilizer effect depends on its potassium oxide content. Mainly include potassium chloride, potassium sulfate, plant ash, potassium Epsom salt, monopotassium phosphate (potassium dihydrogen phosphate), etc. Most of them can be dissolved in water, and the fertilizer effect is faster. And can be absorbed by the soil, not easy to lose. Appropriate application of potassium fertilizer can make crop stems grow strong, prevent lodging, promote flowering and fruiting, and enhance drought resistance, cold resistance, and resistance to diseases and insect pests. The unit fertilizer with the indicated amount of potassium (K or K₂O) is potash fertilizer. It can improve the potassium supply capacity of soil and the potassium nutrition level of plants.
A single-element "potash" (K or K2O) marked amount is a single-element fertilizer (potash fertilizer); it indicates that the "potassium" element is high and other elements are low, which is also a "potash fertilizer". "Potash fertilizer" is divided into binary compound potassium fertilizer and ternary compound potassium fertilizer.
According to the chemical composition of potassium fertilizer, it can be divided into chlorine-containing potassium fertilizer and chlorine-free potassium fertilizer. Potash fertilizers are all water soluble but also contain certain other insoluble components.
The main types of potassium fertilizers are potassium chloride, potassium sulfate, potassium dihydrogen phosphate, potassium rock salt, potassium magnesium salt, carnallite, potassium nitrate, and kiln dust potassium fertilizer.
Potassium chloride contains 50% to 60% potassium oxide. It is mainly made of carnallite, potassium halite and bittern. Potassium chloride is easily soluble in water, with a solubility of 34.7% at 20 degrees Celsius and 55.7% at 100 degrees Celsius. It is a quick-acting fertilizer that can be directly absorbed by plants. Potassium chloride is not very hygroscopic, usually does not agglomerate, and has good physical properties. Easy to apply
The production method of potassium sulfate:
One is directly produced from natural minerals and hard salt mines. The second is obtained by conversion of potassium chloride, and 70% of the potassium sulfate produced in the world is produced by the conversion method. Potassium sulfate contains 50% to 54% potassium oxide, and the purer potassium sulfate is white or light yellow. Diamond or hexagonal crystal, hygroscopicity is much lower than potassium chloride, good physical properties, not easy to agglomerate, cheap to apply.
