Cabbage, cabbage, leeks, celery, cabbage, etc., can easily absorb nitric acid nitrogen fertilizer during growth, such as the application of ammonium nitrate, leaf vegetable vegetables are absorbed nitrate ions, nitrate ions will be entered after human consumption Human body, human volume poisoning.

Second, vegetables do not water after applying urea

The nitrogen component contained in urea is amido-ammonium nitrogen, and the amido-ammonium nitrogen is converted into ammonium carbonate or ammonium bicarbonate by the action of urease secreted by soil microorganisms before it can be absorbed and used by vegetable roots. If the urea is watered immediately after it is applied or rain is encountered, ammonium nitrate will be lost. Therefore, regardless of whether the basal fertilizer or top dressing of vegetables, urea should be 5 to 6 days after application, so that all the conversion and then watering, so as to avoid losses.

Third, do not apply ammonium bicarbonate when water shortage in vegetable fields

Ammonium bicarbonate is extremely unstable in its chemical properties and is easily volatile. When applying ammonium bicarbonate in vegetable fields, regardless of whether it is used as a base fertilizer or as a top dressing, deep application should be carried out in the case of wet vegetable fields, and the soil should be covered immediately after application. If the weather is dry, and it is not possible to use ammonium bicarbonate, dilute with water or apply watering.

Four, leafy vegetables do not spray high concentrations of nitrogen fertilizer

If urea, ammonium sulfate, etc., are used for foliar spraying of vegetables, although the leaf color of vegetables can be green and color is good, the content of harmful salts in green leafy vegetables will increase significantly, and then affect the health of consumers.

Fifth, greenhouse vegetables do not use higher concentrations of ammonium nitrogen fertilizer

Due to the high temperature and high humidity in the greenhouse, high-concentration ammonium nitrogen fertilizers are easily decomposed under the action of soil enzymes under suitable temperature and humidity conditions, and finally converted into gaseous ammonia, which in turn causes vegetable ammonia poisoning and affects vegetables. The quality and output.

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