As the saying goes, "3 nitrogen, 6 phosphorus, September potassium", potassium fertilizer is also called "fruit fertilizer." Applying potassium fertilizer at the right time and in the right amount can increase the fruit significantly, increase the sugar content, and increase the degree of coloration. It also makes the fruit color bright, the peel is smooth, and the inner quality of the flavor is improved. The ability to resist pests and diseases is also improved, and the storage and transport resistance is enhanced. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Double Arm Manual Medical Pendant
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Selection of Potassium Fertilizer: Potassium nitrate 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 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. It can be used to promote root germination and flower bud differentiation, 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 contains 50%~52% of potassium, which is a chemical neutral and physiological acid fertilizer. It has good water solubility, but long-term use will aggravate soil acidification. It is suitable for coloring to fruit ripening, promoting fruit coloration and increasing Fruit sweetness.
When to add potassium: The absorption of potassium by apple trees is generally July and 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.
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.
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, and then Shallow watering. For example, using 0.3%~0.5% potassium dihydrogen phosphate solution or amino acid potassium 300~500 times solution for foliar application, the effect is better. 