As the saying goes: "3 nitrogen, 6 phosphorus, August potassium", now the apple tree is time to apply potash. Potassium is one of the important elements required for fruit trees. In particular, it has an irreplaceable role in improving apple quality and improving fruit quality. Therefore, potassium fertilizer is also called "fruit fertilizer."
Benefits of potassium supplementation: Potassium fertilizer can be applied in a timely and appropriate amount, which can significantly increase the fruit, increase the sugar content, and improve the coloration degree. It can also make the fruit color bright, the peel skin smooth, the flavor and other internal qualities can be improved; the resistance to pests and diseases is correspondingly improved. Improve, storage and durability.
Which potash is used: Potassium nitrate contains 13.5% nitrate nitrogen and 46% potassium. It is a chemically neutral, physiologically neutral fertilizer with good water solubility. Long-term application will not cause soil acidification. It is suitable for the expansion of fruit trees from the expansion period to the early stage of coloring. Because it contains nitrate nitrogen, it is not recommended to use it later, which is easy to cause greening.
Potassium dihydrogen phosphate 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 coloring period can promote the coloring of the powder and increase the sweetness of the fruit; the fruit can be used to promote the ripening of the branches and increase the degree of lignification of the fruit.
Potassium sulphate theoretically contains 54% potassium, generally 50%. It is a chemically neutral and physiologically acidic fertilizer with good water solubility. However, long-term use will aggravate soil acidification and is suitable for coloring to fruit ripening and promoting fruit. Coloring on the powder increases the sweetness of the fruit. Therefore, according to the growth period of crops and the law of fertilizer demand, the fertilizer is used in the most sensitive period of crop fertilizer, and according to the fertility characteristics of crops, the principles of light, medium and heavy supplements are mastered.
When to add potassium: The absorption of potassium by apple trees is generally from July to August. During this time, the appropriate amount of potassium fertilizer is applied to the fruit trees, which will get twice the result with half the effort. If the same amount of potash is applied before early spring or flowering, there will be no obvious effect on the yield or the degree of coloration.
How much is suitable: the application rate can be applied to one kilogram of pure potassium per 100 kilograms of production. If the application is excessive, the physiological function of the fruit tree will be destroyed, which will affect the absorption and utilization of other elements. Excessive potassium application in apple trees shows magnesium deficiency, and the calcium content in the tree is also relatively reduced.
In addition, when applying potassium fertilizer, potassium sulfate should be selected with high absorption efficiency and obvious effect, followed by potassium chloride, or organic fertilizer with high potassium content such as plant ash or decomposed chicken manure can be applied under the tree. Then shallowly watering. If the leaf surface spray is supplemented with 0.3% to 0.5% potassium dihydrogen phosphate solution or amino acid potassium 300-500 times solution, good results can also be obtained.
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