The safe use of vegetables includes two implications: First, to ensure the safety of consumers; Second, to ensure the safety of vegetable growth and development.
Improper fertilization of vegetables will not only make the vegetables produce toxic effects, affect the health of consumers, but also affect the growth and development of vegetables, so that the growth and development of vegetables is blocked, leading to stagnation of vegetable growth and even death. Practice has proved that vegetables should be paid attention to the following "five taboos":
Do not apply water after urea
Ammonium, a nitrogen component contained in urea, and amido-ammonium nitrogen are converted into ammonium carbonate or ammonium bicarbonate by the action of urease secreted by soil microorganisms before they can be absorbed and used by vegetable roots. If the urea is watered or rained immediately after application, the amido nitrogen will be lost. Therefore, whether urea or vegetable fertilizer base fertilizer, fertilizer should be 5 to 6 days after application, so that all the conversion and then watering, so as to avoid losses.
Avoid repeated application of ammonium sulfate
In an acidic or calcareous vegetable field, the continuous application of ammonium sulfate will cause the soil to become more acidic, causing the formation of compacted calcareous soils, resulting in poor growth and development of vegetables, and a decline in quality and yield, reducing the cultivation economy. benefit.
Avoiding the application of ammonium bicarbonate in waterlogged vegetable fields
The ammonium bicarbonate fertilizer is chemically unstable and volatile. When applying ammonium bicarbonate in the vegetable field, whether it is used as a base fertilizer or as a top dressing, deep application should be carried out in the wet conditions of the vegetable field, 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.
Leaf vegetable vegetables bogey ammonium nitrate
Cabbage, cabbage, leeks, hollow beans, 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, after consumption of consumer nitrates Will enter the human body, causing consumers to accumulate poisoning.
Leafy vegetable avoid spraying high concentration of nitrogen fertilizer
If urea, ammonium sulfate, etc., are used for foliar spraying of vegetables, although the green color of vegetables leaves can be made green, the content of harmful salts in green leafy vegetables will be significantly increased, which in turn will affect the health of consumers.
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