With the improvement of the quality of life, people cherish life and life more and more, and the quality of vegetables, especially their safety and quality, is becoming higher and higher. Adopting scientific cultivation and management measures to control the content of various harmful substances in vegetable products and producing vegetables that meet pollution-free food standards are the goals that must be achieved in the new era.
1. Silicon-calcium fertilizer is a kind of vitreous mineral fertilizer mainly composed of calcium silicate, slightly alkaline or neutral, insoluble in water and soluble in acid. Silicon-calcium fertilizers usually contain calcium and magnesium, so they are also called calcium-silicon fertilizers or silicon-calcium-magnesium fertilizers.
Second, the mechanism of silicon and calcium fertilizers to improve the safety of vegetables
1. Application of calcium-silicon fertilizer can reduce the incidence of vegetable crop diseases and insect pests, reduce the amount of pesticides, and reduce pesticide residues in vegetable products. On the one hand, silicon can inhibit soil bacteria. If the plants are continuously planted in greenhouses and other facilities for more than three years, they will experience the accumulation of fungi and other soil-borne pathogens, which will seriously affect the yield and quality of vegetables. The use of silicon-silicon fertilizer will effectively prevent the survival and reproduction of mold. On the other hand, vegetable crops absorb silicon, and silicified cells are formed in the body to make the surface of cell walls of stems and leaves thickened and the stratum corneum is increased, thereby improving the resistance to pests and diseases.
2. Application of silicon calcium fertilizer can reduce or eliminate heavy metal pollution in soil because: First, after the application of silicon-calcium fertilizer, silicic acid ions contained in silicon-calcium fertilizer react with heavy metals such as cadmium, mercury, and lead. The reaction formed new silicic acid compounds that were not easily absorbed by the plants and precipitated; secondly, the application of silicon and calcium fertilizers increased the oxidative capacity of the roots of the vegetable crops, oxidized cadmium, and reduced the solubility of heavy metals such as manganese, thereby inhibiting the crops. Absorption of these substances effectively prevents the pollution of heavy metals from vegetables, thereby reducing the pollution to below the national safety standards.
3. Application of silicon calcium fertilizer can reduce the nitrate content in vegetables. Si-Ca fertilizer is an inherent natural mineral fertilizer in the soil. It is not only beneficial to the growth of vegetable crops, but also regulates the nitrogen, phosphorus and potassium of vegetable crops in different stages. The demand for nutrients such as nutrients has the effect of inhibiting supply when excessive nutrients are applied. The application of calcium-silicon fertilizer can inhibit the excessive absorption of nitrogen fertilizer and reduce the nitrate content in vegetables. On the other hand, as a nutrient element involved in photosynthesis, it can promote the assimilation of ammonia, so that the ammonium nitrogen or nitrate nitrogen in vegetable crops can be quickly converted into amino acids or proteins, and it can also reduce the nitrate content in vegetables.
4. Application of calcium-silicon fertilizer can reduce the residual pollution of vegetable crops. Silicon-calcium fertilizer can increase pollen viability. Using silicon-calcium fertilizer at flowering stage can increase the fruit rate of fruits and vegetables, which can be used to promote the promotion of fruits and vegetables. The use of growing hormone substances in fruit set in vegetable crops. In summary, the application of calcium-silicon fertilizer can effectively reduce the content of heavy metals, pesticide residues, hormone residues, nitrates, and other harmful substances in vegetable products. It is an ideal high-quality fertilizer for producing pollution-free vegetables.
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