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Different nitrogen fertilizers are applied depending on the type of vegetables. Such as spinach, cabbage, lettuce and so on. It is easy to accumulate large amounts of nitrate, and nitrate nitrate should be absolutely banned. For fruits and root vegetables with less nitrate accumulation, such as eggplant, green pepper, radish, carrot, etc., it is necessary to use nitrate fertilizer in addition to strict control of dosage and In addition to the number of times, it should be stopped 30 days before harvesting.
Appropriate application of nitrate nitrogen fertilizer due to different planting time. Under normal circumstances, the summer and autumn vegetables that grow in the high temperature season can be applied in small amounts, while the application of nitrate nitrogen fertilizer to winter vegetables and spring vegetables is strictly prohibited.
Properly controlled due to different soil types. Generally, in high-fertility soils, especially in high-fertility clay or soil, nitrate accumulation is more, and nitrogen fertilizer should not be applied or applied; in fertility, especially on light-weight sand soil, The accumulation of nitrate is less, in addition to the application of organic fertilizer, the application of ammonium nitrogen fertilizer should also be controlled.
The fertilizer is mainly organic fertilizer, and the base fertilizer is the main. Nitrogen fertilizer should be applied to the soil in depth; the application of nitrogen fertilizer should be applied early and deep to reduce the accumulation of nitrate. At the same time, we should minimize the amount and frequency of nitrogen fertilizer. When fertilizing ammonium fertilizer with leafy vegetables, the amount of mu should not exceed 30 kg, and it is strictly forbidden to spray nitrogen fertilizer on the foliage. 
Nitrogen application in the production of pollution-free vegetables
It is forbidden to use nitrate nitrogen fertilizer on vegetables, especially leafy vegetables, to avoid the accumulation of nitrate. The use of other forms of nitrogen fertilizer should also control the amount of use and the number of uses, and pay attention to changes in the use environment.
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