At present, people often attach great importance to the harm of pesticide residues, and ignore the hazards of fertilizer residues, which is very unscientific. In fact, if a large amount of chemical nitrogenous fertilizer is applied to vegetables, it will cause fertilizer damage, resulting in burning of the roots of the crops and soil compaction, affecting the yield. Second, it is easy to cause the concentration of soil solution is too high, so that the absorption capacity of vegetables is hindered, the permeability resistance of cells increases, and the root absorption is difficult. Third, it will cause excessive levels of nitrate and nitrite. Frequent consumption of vegetables with excessive levels of nitrates and nitrites can cause chronic poisoning. Therefore, the World Health Organization requires that the content of nitrate and nitrite per kilogram of vegetables should not exceed 4.32 milligrams and 15.6 milligrams, respectively.
Therefore, we call for careful application of chemical fertilizers and scientific fertilization in vegetable production.
1, a lot of application of organic fertilizers. Organic fertilizer is a high-quality fertilizer with complete nutrient content and stable fertilizer effect. After application, it can provide adequate and balanced nutrition for vegetables to ensure high quality and high yield of vegetables.
2. Control the application of nitrogen fertilizers and increase the total application of phosphorus and potassium fertilizers. Phosphorus, potassium as a quality element, can participate in all biochemical reactions in vegetables, can activate more than 60 kinds of enzymes in vegetables, enhance the stress resistance of vegetables.
3. Vigorously promote vegetable-specific compound fertilizers. Special fertilizers generally have the advantages of complete nitrogen, phosphorus and potassium nutrients, balanced nutrition, scientific and reasonable formula, and strong pertinence. After application, they can significantly increase the output of vegetables and improve the quality of vegetables.
4. To promote new fertilizers such as zinc, molybdenum, calcium, and magnesium that can actively improve the quality of vegetables. These nutrients are essential for the growth of vegetables.
5, vigorously promote bio-fertilizer, in particular, to promote bio-organic compound fertilizer. Biofertilizer contains microorganism-activated bacteria. It is a “four-in-one†fertilizer compounded by organic fertilizer, inorganic fertilizer, bacterial fertilizer, and synergist. It realizes the scientific cooperation of various fertilizers and integrates various fertilizers. Features, complementary advantages, mutual benefits, it represents the current level of fertilizer application technology, is one of the best fertilizer varieties to achieve balanced fertilization of vegetables.
6, in order to reduce the nitrate content in vegetables in the protection, without affecting the indoor temperature, should increase the number of awnings, window opening and time, increase the light intensity, is conducive to assimilation of nitrates in vegetables, reduce the body of nitric acid The content of salt.
7. In order to reduce and control the excess nitrate accumulation, nitrogen inhibitors are currently used internationally. For example, the commonly used “dicyandiamide†is a nitrogen-based cyanide compound. Addition of 10% nitrogen fertilizer can reduce nitrate in vegetables. About 10% of the content.
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