The main potash fertilizers on the market are potassium nitrate, potassium sulfate, potassium dihydrogen phosphate, potassium chloride, etc. What are the characteristics of various potash fertilizers, and what are the “small tempers� Only by figuring out the differences can they be better utilized.
Potassium nitrate. It contains 13.5% nitrate nitrogen and 46% potassium. It is a chemical neutral and physiological neutral fertilizer with good water solubility. It will not cause soil acidification after long-term application. It is suitable for the expansion of vegetable and fruit young fruit to the early stage of coloring, which can promote the expansion of pulp cells. Because it contains nitrate nitrogen, it is not recommended to use it later, which is easy to cause greening.
Potassium dihydrogen phosphate. It contains 52% phosphorus and contains about 34% potassium. It is a chemically neutral, physiologically neutral fertilizer with good water solubility. Generally, it can be used to promote root germination and flower bud differentiation before and after flowering, and provide energy for flowering and fruit setting. The use of the coloring period can promote the coloring of the powder and increase the sweetness of the fruit; the use of the fruit after harvesting can promote the ripening of the branches and increase the degree of lignification of the fruit.
Many people ask potassium nitrate and potassium dihydrogen phosphate, which one is better? In fact, there is no such thing as better, the key is how to use it. Potassium nitrate is a nitrogen-potassium binary compound fertilizer, and potassium dihydrogen phosphate is a phosphorus-potassium binary compound fertilizer. Therefore, different products should be adopted according to different periods. The nitrate nitrogen in potassium nitrate is easily lost by rain, so it is generally not recommended for paddy fields.
Regarding potassium nitrate and potassium dihydrogen phosphate, it can be understood that potassium nitrate is used when the amount of nitrogen used for crop growth is large, and potassium dihydrogen phosphate is used when the growth of the crop requires more phosphorus. Potassium nitrate was used during the expansion period, and potassium dihydrogen phosphate was used during the coloring period. Potassium nitrate was used in the normal growth period, and potassium dihydrogen phosphate was used in the flowering stage. Strictly speaking, these two products cannot be regarded as pure potash. Even potassium dihydrogen phosphate is classified in phosphate fertilizers in many classifications.
These two fertilizers are quick-acting fertilizers, and the market price is higher than the average potash fertilizer. Therefore, it is not recommended to use the base fertilizer, especially potassium nitrate, which is used for top dressing or root fertilization. If there are conditions, it is better to use the two.
Potassium chloride. The appearance of potassium chloride is white or light yellow crystal, and the iron salt is red. Soluble in water, it is a high concentration of quick-acting potash. It can be used as base fertilizer and top dressing. The amount of base fertilizer is 8-10 kg, the amount of fertilizer is 5-7 kg, and the foliar spray is 0.5%-1%.
The scope of application is smaller than that of potassium sulfate. Special attention should be paid to the use of chlorine-sensitive crops such as watermelon, grape, and potato to avoid "chlorine damage." In addition, potassium chloride is not suitable for saline-alkaline soil, but chloride ions in potassium chloride promote photosynthesis and fiber formation, and are particularly suitable for application to fiber crops such as hemp.
Potassium sulfate. The appearance of potassium sulfate is white crystal or colored crystals or particles. Potassium containing theory is 54%, generally 50%. It is a chemically neutral, physiologically acidic fertilizer with good water solubility. It is characterized by low moisture absorption, is not easy to agglomerate when stored, and is easily soluble in water.
Applicable to all kinds of crops, can be used as base fertilizer, top dressing and top dressing. The base fertilizer is generally 10-12 kg per mu, the amount of topdressing fertilizer is 5-7 kg, and the foliar spray fertilizer is 0.5%-1%. Potassium is generally adsorbed by the soil and will not be lost. However, it is also necessary to adopt a "small amount of meals" on the sand with poor fertilizer retention ability. Generally, it is best applied on potassium plants such as potatoes and melons.
However, long-term use will increase soil acidification, and it is suitable for fruit coloring to fruit ripening, promoting fruit coloration and increasing fruit sweetness. It is said that manganese poisoning in many fruit trees is caused by soil acidification, and a direct cause of soil acidification is the use of potassium sulfate throughout the year. (Rural Public News)
This article URL: What are the main varieties of potash in agriculture? What is the difference in the use of different types of potash?
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