How to reduce fertilizer pollution in vegetable production

First, the re-application of organic fertilizer organic fertilizer will not lead to the accumulation of nitrate in vegetables, but also improve the quality of vegetables. The organic fertilizer is preferably applied after high-temperature stacking or biogas fermentation and decomposing, which can kill bacteria and eggs, reduce the amount of pesticides, and increase the yield and quality of vegetables. The use of biogas fertilizer to grow vegetables is the best pollution-free vegetables. Second, nitrogen fertilizer to apply nitrogen fertilizer as a base fertilizer or fertilizer application at the seedling stage, is conducive to early growth of vegetables, will help reduce the accumulation of nitrate in soil and vegetables. Third, deep nitrogen application of nitrogen fertilizer applied to the depth of 10-15 cm in the soil, can reduce the loss of nitrogen, improve nitrogen fertilizer utilization. In deep soils, soil air is in an off-gassing condition, and nitrification is slow, which can reduce the accumulation of nitrates in vegetables. Fourth, control the amount of nitrogen fertilizer The accumulation of nitrate in vegetables with the increase in the amount of nitrogen fertilizer increases. The amount of nitrogen applied per acre should be controlled within 30 kilograms, 70%-80% of which should be applied as a deep application of base fertilizer, and 20%-30% should be used as a deep application of seedling fertilizer. 5. The application of nitrate nitrogen fertilizer and compound fertilizer containing nitrate nitrogen without or with minimal application of nitrate fertilizer can easily accumulate nitrate in vegetables. Therefore, it is not suitable for use on vegetables. Ammonium nitrogen fertilizer and ammonium ammonium fertilizer, such as ammonium sulfate, can be used. , ammonium bicarbonate, urea and so on. Sixth, due to different kinds of vegetables fertilizing different types of vegetables, the degree of absorption of nitrate accumulation is different, cabbage and green leafy vegetables are likely to accumulate nitrate, can not use nitrate nitrogen fertilizer; Solanaceae, fruit vegetables and root vegetables, nitric acid Salt accumulation is less and can be applied appropriately, but application of nitrate nitrogen fertilizer should be stopped 15-30 days before harvest. Seven, leafy vegetables should not be foliar spray N fertilizer, direct contact with air, ammonium nitrogen easily converted to nitrate-nitrogen absorption by the leaves, increasing the accumulation of nitrate. Spraying other types of fertilizers from the foliage also tends to contaminate the leaves, causing poor food. 8. Do not use sewage to irrigate sewage and water the vegetables. It is easy to be contaminated. Wastewater discharged from factories and mines contains more toxic substances such as chlorine, arsenic, tin and lead, and should not be used for watering vegetables. Urban sewage should be treated in a harmless manner. After killing germs and eggs, it is mixed with clear water.

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