Vegetable pollution-free fertilization has to pay attention to
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2. Limited application of chemical fertilizers During the growth of pollution-free vegetables, a certain proportion of chemical fertilizers may be applied appropriately, but the application rate should be controlled to be scientific and reasonable. Excessive application of chemical fertilizers can cause pollution to soil and groundwater. The proportion of nitrogen, phosphorus and potassium fertilizers should be improved, soil fertilization should be carried out, and rational application should be carried out to facilitate the balanced absorption of nutrients by vegetables.
3. When nitrate-nitrogen fertilizers such as ammonium nitrate, calcium nitrate and potassium nitrate are applied to vegetables without nitrate fertilizer, the nitrate content in vegetables will be multiplied. Nitrate is easy to cause red blood protein degeneration in humans and endangers people's health. Therefore, it is strictly forbidden to apply nitrate nitrogen fertilizer in vegetable production.
4. Nitrogen Fertilizer Deep application of soil nitrogen fertilizer after deep application of cover soil can reduce its exposure to air and sunlight, prevent nitrogen volatilization and contaminate vegetables. Generally, the nitrogen fertilizer should be applied at a distance of 10 to 15 cm from the soil surface. The roots of the solanaceous fruits and root vegetables should be applied to the root layer below 15 cm. Deep application of nitrogen fertilizer can not only reduce the accumulation of nitrate in vegetables, but also improve its quality and yield.
V. The application of trace elements and trace elements is an indispensable nutrient in the growth process of vegetables. Although the amount is small, it plays a role in coordinating various nutrient ratios and promoting photosynthesis. Adding micro-fertilizer can not only increase the yield of vegetables, but also effectively improve the quality of vegetables. But be careful, be sure to use it correctly, and don't blindly apply it.