How to Calcify Apple Trees

In apple orchards, weather conditions play a significant role in calcium uptake. Overcast or dry weather can lead to calcium deficiency in apples, as these conditions hinder the plant's ability to absorb nutrients effectively. Additionally, when apple fruits are bagged, the transpiration of young fruit is restricted, which further increases the risk of calcium deficiency. In densely planted orchards with thick foliage, poor air circulation and limited light penetration can cause calcium deficiency, especially in the inner parts of the tree and on the lower fruits. Therefore, in rainy or dry years, it is crucial to pay extra attention to calcium supplementation in both densely planted and bagged orchards. The critical period for calcium absorption in apple trees occurs during the growth of new shoots. Research shows that from the 21st day after flowering until early July, approximately 90% of the calcium required by the fruit is taken up. This makes it essential to apply calcium supplements during this time. Starting 21 days after flowering, it is 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 orchards, special attention should be given to calcium supplementation from the time of flowering until the fruit is bagged. Since soil fertility may be low in many orchards, foliar sprays are the most effective method for calcium application. It is advisable to use products such as calcium fulvic acid or chelated calcium, which provide organic forms of calcium that are easily absorbed by the plant. When applying calcium through foliar sprays, it is best to spray the undersides of leaves and the fruit surfaces. The ideal time for spraying is either before 10 a.m. or after 4 p.m., to avoid high temperatures and reduce the risk of leaf burn. Consistent and timely calcium management is key to ensuring healthy fruit development and preventing disorders like bitter pit and internal breakdown.

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