The application of silicon calcium and magnesium fertilizer in apple orchard

Silicon calcium and magnesium fertilizer is a by-product of the production of alumina - red mud, containing 20.58% of bismuth-soluble silica, 40.95% of calcium dioxide, 19.0% of magnesium oxide, 2.4% of potassium oxide and 0.68% of iron oxide. Silicon calcium thickens the cell wall, creating a mechanical barrier that prevents fungal infestation and larval drilling. This has a good effect on rejuvenating the tree and improving the disease resistance of the tree. According to the Shandong Institute of Fruit Research, the gold crown or Guoguang apple strain applied 5 kg of silicon calcium and magnesium fertilizer, the calcium content of the leaves increased by 8.2%-34.5%, and the silicon content increased by 5.7%-35.4%. After 4 years of continuous application, the incidence of rot disease decreased by 11%-22% compared with the control; for 3 consecutive years, the average growth of dry week was 13.2%-19.2% higher than the control. It also has certain effects on increasing fruit firmness, improving fruit quality and improving storability. The fruit firmness is 1.3%-5.7% higher than the control, the soluble solid content is increased by 27%-6.4%, and the golden fruit is stored at the end of December. Compared with the control, it decreased by 15.9%-45.6%.

Silicon calcium magnesium fertilizer is an alkaline mash fertilizer with a pH of 10-12, so it should be applied in slightly acidic and acidic soils. Late autumn or early spring, mixed with the base fertilizer is better.
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