When is the best time to apply potassium fertilizer to apple trees?
When is the best time to apply potassium fertilizer to apple trees? Please explain. Applying potassium fertilizer to apple trees at the right time and in the right amount can significantly increase fruit size, raise sugar content, improve coloring, and also make the fruit color more vivid, the skin smooth and clean, and improve the internal quality such as flavor and taste. The uptake of potassium by apple trees generally occurs from early July to early August. During...
When is the best time to apply potassium fertilizer to apple trees? Please explain.
Applying potassium fertilizer to apple trees at the right time and in the right amount can significantly increase fruit size, raise sugar content, improve coloring, and also make the fruit color more vivid, the skin smooth and clean, and improve the internal quality such as flavor and taste. The uptake of potassium by apple trees generally occurs from early July to early August. Applying an appropriate amount of potassium fertilizer to the trees during this period will yield twice the result with half the effort. If the same amount of potassium fertilizer is applied in early spring or before the flowering period, there will be no obvious effect on either yield or coloring.
The application rate of potassium fertilizer for apple trees can be suitably set at one kilogram of pure potassium per 100 kilograms of yield. Excessive application will instead damage the physiological functions of the trees and affect the uptake and utilization of other elements. Excessive potassium fertilizer application to apple trees manifests as magnesium deficiency symptoms, and the calcium content in the tree will also be relatively reduced.
In addition, when applying potassium fertilizer, it is advisable to choose potassium sulfate, which has high uptake and utilization rates and obvious effects, followed by potassium chloride. Organic fertilizers with relatively high potassium content, such as plant ash or decomposed chicken manure, can also be broadcast under the trees, then lightly covered with soil and watered. If a 0.3%-0.5% potassium dihydrogen phosphate solution or a 300-500 times dilution of amino acid potassium is used for foliar spraying as a supplement, relatively good results can also be achieved.
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