Do you know the tips of foliar fertilizer for fruit trees?

Fertilization of apple trees can only be effective if roots and leaves are applied at the same time. Foliar fertilization should also be carried out according to the growth needs and conditions of fruit trees. Let me talk about my opinion on the foliar fertilizer of apple trees.

What is foliar fertilizer? Foliage fertilizer is not a kind of fertilizer, but a general term for fertilizers suitable for spraying on leaves. Not all fertilizers that can be melted are suitable for foliar fertilizer. For example, urea in nitrogen fertilizer is suitable for foliar fertilizer, while ammonium bicarbonate is generally not suitable for foliar fertilizer.

Why use foliar fertilizer? Applying foliar fertilizer to apple trees is mainly to supplement root fertilizer, which can quickly supplement nutrients and give full play to fertilizer efficiency, especially foliar fertilizer supplemented according to the growth needs of fruit trees, which can quickly supplement nutrients needed by fruit trees.

How to use foliar fertilizer for apple trees The foliar fertilizer for apple trees in our family is mainly carried out at various stages before flowering, after flowering, after bagging, after picking bags and before defoliation.

Before flowering, I usually use the combination of potassium dihydrogen phosphate+boron fertilizer+brassinolide to improve the fruit setting rate and enhance the cold resistance of fruit trees.

After flowering, it is mainly the combination of calcium fertilizer+boron+trace elements, which promotes the absorption of calcium by fruit trees, supplements trace elements and promotes cell division.

After bagging, spraying potassium dihydrogen phosphate for 2-4 times according to the fruit trees, adding total nutrient humic acid liquid fertilizer 1-2 times in the middle, and adding brassinolide 1-2 times when spraying potassium dihydrogen phosphate.

After picking bags, calcium fertilizer is the main ingredient, and appropriate boron fertilizer and trace elements are added to supplement calcium to prevent and treat bitter pox and pockmarks.

Spraying urea on apple leaves three times before defoliation, adding appropriate zinc fertilizer, supplementing nutrients, and promoting nutrient reflux of leaves.

Note: the use of foliar fertilizer should be combined with root fertilizer, and the two should cooperate with each other. Without the foundation of root fertilizer, it is meaningless to apply foliar fertilizer; The more foliar fertilizer is not the better, and the concentration must not be too high. For example, we usually use 0.2% concentration of potassium dihydrogen phosphate; Using foliar fertilizer according to the growth of fruit trees does not mean that it must be fixed. For example, in orchards prone to iron deficiency and lobular disease, iron fertilizer and zinc fertilizer should be added appropriately; Spraying foliar fertilizer should pay attention to avoid the high temperature period at noon, and also pay attention to careful mixing with other chemicals to avoid phytotoxicity.