How to fertilize pollution-free vegetables?
There are three ways to fertilize pollution-free vegetables. 1. Rational application of nitrogen fertilizer 1. In addition to improving the yield of vegetables, the amount of nitrogen fertilizer used to control the amount of nitrogen fertilizer can also improve the quality of vegetables. Therefore, rational application of nitrogen fertilizer is one of the main problems in the production of pollution-free vegetables. The application amount of nitrogen fertilizer should be properly controlled. The low-nitrate nitrogen fertilizer ammonium sulfate should be used to reduce the nitrate content in vegetables. The ratio of inorganic nitrogen to organic nitrogen is 1:1 in the application of nitrogen fertilizer. 2. Using the "attack and tail control" nitrogen application technique, the plant does not apply quick-acting nitrogen fertilizer in the late growth stage, and the short-term vegetables use 70% of the nitrogen fertilizer as the base fertilizer; the long-term vegetables use 40% of the total nitrogen fertilizer as the base fertilizer, and the deep application of the base fertilizer is adopted. , the method of topdressing or applying. Second, increase the application of phosphorus and potassium Phosphate fertilizer can provide phosphorus nutrients for vegetables, inhibit the activity of heavy metals such as cadmium, lead, zinc and arsenic, reduce toxicity, reduce harm, and increase potassium fertilizer, which can reduce the accumulation of nitrate in vegetables and improve the quality of vegetables. Potassium is also called "quality element". When potassium is applied to vegetables, the content of vitamin C and sugar in the fruit is significantly increased, and the storage durability is also improved. Studies have shown that the application of potassium fertilizer on the basis of nitrogen fertilizer and phosphate fertilizer can reduce the nitrate content of spinach, and the nitrate content of lettuce and celery also decreases with the increase of potassium application rate. The ratio of nitrogen, phosphorus and potassium is 1:0.2:0.5 for short-term dishes and 1:0.5:0.6 for long-term dishes. Third, increase the application of organic fertilizer Adding fully decomposed organic fertilizer can increase the soil organic matter content, enhance the soil's adsorption capacity and complexing ability, and effectively curb the toxicity of cadmium and lead to vegetable crops. At the same time, applying organic fertilizer can reduce nitric acid more than chemical fertilizer. The salt content reduces the nitrate content by about 45%. Some tests have shown that: celery applied organic fertilizer, the nitrate content is 744mg/kg, while the chemical fertilizer, the nitrate content is as high as 1480mg/kg. Therefore, organic fertilizer has little pollution to the vegetable soil environment. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
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