Potassium is one of the important elements needed for fruit trees, especially for improving apple quality and improving fruit quality. Therefore, potassium is also called fruit fertilizer. Timely and appropriate application of potash fertilizer can significantly increase fruit size, increase sugar content, and increase the degree of coloration. Can also make the fruit color bright, smooth skin, flavor and other intrinsic qualities improved. The resistance to pests and diseases has also been improved, and the resistance to storage and transportation has been enhanced. What is timely? Absorption of potassium by apple trees is less in the initial stage of growth and gradually increases afterwards. The critical period of peak absorption is in the late growth stage. It is usually from early July to early August. During the period of time, applying appropriate amount of potash fertilizer to fruit trees will have a multiplier effect. If an equal amount of potash is applied before early spring or flowering, it will not have a significant effect on yield and coloration. What is the right amount? The application rate may be one kilogram of pure potassium per 100 kilograms of output. Excessive application, on the contrary, will destroy the physiological function of fruit trees and affect the absorption and utilization of other elements. Excessive application of potassium in apple trees shows magnesium deficiency, and the calcium content in the tree is relatively low. In addition, in the application of potash fertilizer, should use high absorption and utilization, the effect of obvious potassium sulfate is appropriate, followed by potassium chloride, can also be used ash or decomposed chicken manure and other high potassium organic fertilizer under the tree Spread, then shallow water. Such as using 0.3-0.5% potassium dihydrogen phosphate solution or amino acid potassium 300-500 times liquid foliar spray supplement, can also receive better results. China Agricultural Network Editor
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