Potassium is one of the important elements required by fruit trees, especially for improving the quality of apples and improving fruit quality. So potash is also called fruit fertilizer. So, what kind of fertilizer is potash? What are the types of potash fertilizer? What is the role and function? Let's take a look together below.
What kind of fertilizer is potash?
Potassium fertilizer can promote crop nutrient transfer, tissue maturity, fruit swelling, accelerating growth and improving resistance. Common potash fertilizers are potassium sulfate, potassium nitrate, and potassium dihydrogen sulfate. When using, pay attention to a reasonable combination of specific crops. If it is tobacco or sugar crops, potassium sulfate can be selected. For fiber crops, potassium chloride can be used.
Potassium fertilizer role and function?
Potassium fertilizer can promote crop photosynthesis, increase crop yield, improve crop resistance to cold and disease; promote crop metabolism of carbohydrates and nitrogen, control and regulate the activity of various mineral nutrients in crops; regulate crops The internal pressure of the cells prevents the crops from wilting.
What are the types of potash fertilizer?
1. Potassium Nitrate
Containing 13.5% of nitrate nitrogen and 46% of potassium, it is a chemically neutral and physiologically neutral fertilizer with good water solubility. Long-term application will not cause soil acidification. It is suitable for vegetables and fruit trees from the expansion stage to the initial stage of coloring, which can promote the expansion of pulp cells. Because it contains nitrate nitrogen, it is not recommended to use it in the later stage of coloring, which will easily cause blueness.
2. Potassium dihydrogen phosphate
It contains 52% phosphorus and 34% potassium. It is a chemically neutral and physiologically neutral fertilizer with good water solubility. Generally before and after flowering, it can be used to promote root germination and flower bud differentiation, and provide energy for flowering and fruit setting. Use in the coloring period can promote the powder coloring and increase the sweetness of the fruit; use after the fruit is picked can promote the maturity of the branches and increase the degree of fruit lignification.
Many people ask which one is better, potassium nitrate or potassium dihydrogen phosphate? In fact, there is no such thing as which is better. The key is how to use it. When crops use a lot of nitrogen, potassium nitrate is used; when crops require more phosphorus, potassium dihydrogen phosphate is used. Potassium nitrate is used in the swelling period and potassium dihydrogen phosphate is used in the coloring period. Potassium nitrate is used in the normal growth period, and potassium dihydrogen phosphate is used in the flowering and fruiting period.
3. Potassium chloride
Potassium chloride appears white or light yellow crystals, and it contains iron salts and appears red. Easily soluble in water, it is a fast-acting potassium fertilizer with high concentration. It can be used as base fertilizer and top dressing. The amount of base fertilizer per mu is 8-10 kg, the amount of top dressing per mu is 5-7 kg, and the foliar spray fertilizer is 0.5% to 1%.
The scope of application is correspondingly smaller than that of potassium sulfate. Special attention should be paid to the use of chlorine-sensitive crops such as watermelon, grapes, potatoes and other crops to avoid "chlorine damage". In addition, potassium chloride is not suitable for saline-alkaline soil, but the chloride ion in potassium chloride can promote photosynthesis and fiber formation, and is particularly suitable for fiber crops such as hemp.
4. Potassium sulfate
The appearance of potassium sulfate is white crystals or colored crystals or particles. Theoretically, it contains 54% potassium, generally 50%. It is a chemically neutral, physiologically acidic fertilizer with good water solubility. It is characterized by low moisture absorption, not easy to agglomerate during storage, and easily soluble in water.
It is suitable for all kinds of crops. It can be used as base fertilizer, topdressing and extra-root topdressing. The general dosage of base fertilizer is 10-12 kg per mu, the dosage of topdressing per mu is 5-7 kg, and the spray fertilizer of 0.5% to 1% is appropriate. Potassium can generally be adsorbed by the soil and will not be lost. However, the measures of "small meals" should be taken on sandy soils with poor fertilizer retention capacity. Generally, it has the best effect on potassium-loving crops such as potatoes and melons. But long-term use will increase the acidification of the soil. It is suitable from the late fruit coloring stage to the fruit ripening stage to promote the fruit powder and color and increase the fruit sweetness.