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First, the disease conditions: soil acidity is high, calcium is easy to lose. The early drought and excessive water supply in the later period are not conducive to the absorption and utilization of calcium. Excessive nitrogen fertilizer, over-pricing, increased the transport of calcium to the fruit, resulting in calcium deficiency in fruit trees.
Second, prevention and treatment methods:
1. Improve the soil, increase the application of organic fertilizer, and promote the stable and balanced supply of nitrogen, phosphorus, potassium, boron, zinc and copper.
2. Calcium application: spraying or applying gypsum, calcium nitrate, multi-effect biological calcium fertilizer or calcium oxide on sandy soil. The fruit surface and the leaf surface are sprayed with 0.5% calcium nitrate or calcium chloride, or 400 times amino acid calcium or amino calcium treasure 500 times.
3, moderate pruning, reasonable fruit thinning.
Author: Sun Shumin
Source: Hebei Xingtang County Agricultural Bureau
Causes of calcium deficiency in apple trees and preventive measures
The calcium deficiency of apple trees mainly shows that the edges of young leaves are rolled up in a cup shape, the veins on the unfolded leaves are neatly arranged and the veins are chlorotic, the edges of the old leaves are necrotic and broken, and in severe cases, the tops die. The fruit has bitter pox disease, ruby ​​spot disease, water heart disease, porphyria, cracked fruit, internal decay and wood streak disease. The branches are uneven and the branches are not round. The roots are short and thick, and when the weight is heavy, the cortex thickens and the dead roots can make a new short root.
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