Silica-calcium-magnesium fertilizer is a by-product of the alumina production process, commonly known as red mud. This material is rich in essential mineral elements, including 20.58% osmium-soluble silica, 40.95% calcium oxide, 19.0% magnesium oxide, 2.4% potassium oxide, and 0.68% iron oxide. When applied to plants, the silicon and calcium components help strengthen cell walls, creating a physical barrier that effectively prevents fungal infections and pest infestations. This not only enhances the tree's overall health but also improves its resistance to diseases.
According to research conducted by the Shandong Institute of Pomology, applying 5 kg of this fertilizer to Golden Delicious or Guoguang apple trees significantly increased the calcium content in leaves by 8.2% to 34.5%, and the silicon content by 5.7% to 35.4%. Over four years of continuous use, the incidence of rot disease was reduced by 11% to 22% compared to the control group. After three years of application, the average weekly dry growth of the trees was 13.2% to 19.2% higher than the control. Additionally, the fertilizer showed positive effects on fruit quality, increasing fruit firmness by 1.3% to 5.7% and improving soluble solid content by 2.7% to 6.4%. The storage stability of Golden Crown apples also improved, with a reduction in spoilage by 15.9% to 45.6% when stored until the end of December.
This type of fertilizer is alkaline, with a pH ranging from 10 to 12, making it most suitable for slightly acidic or acidic soils. It is recommended to apply it in late autumn or early spring, preferably mixed with base fertilizers for better results. Using this fertilizer not only supports plant growth but also contributes to long-term soil health and sustainable agricultural practices.
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