How to Calcify Apple Trees

Overcast or dry weather can significantly increase the risk of calcium deficiency in apple trees. Additionally, when apples are bagged, the transpiration from young fruits is reduced, making them more prone to calcium deficiency. In orchards with dense foliage, poor air circulation and limited light penetration also contribute to calcium deficiency, especially in the inner parts of the fruit and the lower sections. Therefore, in both densely planted orchards and those where bagging is used, extra attention should be given to calcium supplementation, particularly during rainy or dry seasons. The critical period for calcium uptake in apples occurs during the growth of new shoots. Research shows that between the 21st day after flowering and early July, approximately 90% of the calcium required by the fruit is absorbed. It’s essential to apply calcium supplements during this time. Starting 21 days after flowering, it's recommended to apply calcium 3 to 4 times, with each application spaced 7 to 10 days apart. Additionally, one or two more applications should be made 56 days before harvest. For bagged apple orchards, calcium supplementation should be prioritized from the time of flowering until the bagging process begins. Since soil fertility may be poor, foliar sprays are the most effective method for delivering calcium. Products like calcium fulvic acid or chelated calcium are highly recommended due to their organic and easily absorbable forms. When applying calcium through foliar sprays, focus on the underside of leaves and the fruit surfaces. The best times for spraying are before 10 a.m. or after 4 p.m., as this helps maximize absorption and reduces the risk of leaf burn.

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