Ammonium nitrate, calcium nitrate, potassium nitrate, and fertilizers containing nitrate nitrogen can easily accumulate nitrates in vegetables, and vegetable fields should not be used. Ammonium bicarbonate, ammonium sulfate, ammonium nitrate, urea should be used to control the amount and apply the soil deeply. Different types of vegetables absorb different levels of nitrate, spinach, cabbage, leeks, lettuce, etc., it is easy to accumulate nitrate, it is strictly prohibited to use nitrate-nitrogen fertilizer; cabbage, leaf lettuce, etc., less accumulation of nitrate can be applied in small quantities; tomato, eggplant Fruit, vegetables, and root vegetables such as pepper, radish, and carrots are lighter in nitrate accumulation, and nitrate nitrogen can be stopped 15-30 days before harvest. Summer and autumn vegetables have high temperatures in the growing season, and they are not easy to accumulate nitrates. They can apply appropriate nitrogen fertilizers. In winter and spring, the light is weak, and it is easy to accumulate nitrates. No nitrogen fertilizer should be applied or reduced. In soils rich in humus, the nitrate content of vegetables is high and nitrogen fertilizers are prohibited. In low-fertilizer fields, vegetables accumulate less nitrate and can apply nitrogen and organic fertilizers. The deep application of nitrogen fertilizer in the soil below 12-15cm, high fertilizer utilization, slow nitrification, can reduce the accumulation of nitrate in vegetables. The best nitrogen fertilizer at seedling stage is beneficial to reduce nitrate accumulation. Leafy vegetables cannot be fertilized. Foliar spray directly with the air, ammonium ions easily become nitrate ions absorbed by the foliage, nitrate accumulation increased, but also resistant to storage. Organic fertilizer not only does not cause nitrate contamination of vegetables, but also makes vegetables resistant to storage and good quality. However, organic fertilizers should be used after high-temperature heaping and decomposing to kill pathogens and eggs. The biogas slurry has high fertilizer efficiency and can be used frequently, which can reduce the amount of pesticides and increase the yield of vegetables. Vegetables that use biogas slurry are the best pollution-free vegetables. Microcomputer Endoscope Cabinet Microcomputer Endoscope Cabinet,Endoscope Disinfection Storage Cabinet,Endoscope Disinfection Cabinet,Double Door Endoscope Cabinet Taizhou Gaogang District Dixin Medical Equipment Co., Ltd. , https://www.dixinmedical.com