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The application rate of nitrogen fertilizer on vegetables must be controlled. The amount of nitrogen fertilizer in the season generally does not exceed 20 kg per mu. Fertilization should be based on organic fertilizer.
Nitrogen fertilizer is best applied deep and covered with soil, and the fertilizer is applied to the soil layer 15 cm below the soil surface. Apply nitrogen fertilizer as early as possible, and apply it well in vegetable seedlings to avoid large amounts of nitrate accumulated in vegetable products. Even vegetables that are not easily nitrated, such as ginger, tomatoes, radishes, etc., should be stopped from application of nitrogen fertilizer 30 to 45 days before harvest.
Leafy vegetables should not be sprayed with nitrogen fertilizer on the foliar surface, otherwise the sprayed nitrogen fertilizer will be excessively absorbed by the leaves, and a large amount of nitrate will be accumulated in the leaves, and the growth period of the leafy vegetables will be short, and the harmful components in the vegetable products will be More.
Excessive application of nitrogen fertilizer in vegetable production, or improper use of methods, the nitrate content in vegetable products will increase significantly, and people will hinder health after eating.
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