First, avoid applying ammonium nitrate
Cabbage has a short growth period and can easily absorb nitrate nitrogen fertilizer. If excessive nitrate fertilizer is used, the nitrate content of vegetables will exceed the standard. People who consume cabbage over a long period of time will cause cumulative poisoning.
Second, avoid applying water after urea
Urea can only be converted into ammonium carbonate or ammonium bicarbonate by the root system of vegetables, or be adsorbed and stored by soil, only under the action of urease secreted by soil microorganisms. After urea is applied, if it is irrigated or rained immediately, the amide nitrogen will be lost with water, resulting in loss of nitrogen nutrients. Usually apply urea for 5-7 days before irrigating or pouring water.
Third, avoid repeated application of ammonium sulfate
If ammonium sulfate is used continuously in acidic soils, the acidification of the soil will cause the soil to harden and hinder the growth and quality of Chinese cabbage.
Fourth, avoid water application of ammonium bicarbonate
Ammonium carbonate is extremely unstable and volatile, especially in dry and rainy weather. Therefore, the use of ammonium bicarbonate should be irrigated or applied to water after deep application.
Fifth, avoid excessive application of phosphate fertilizer
The excessive application of phosphate fertilizer to Chinese cabbage exceeds 50 kilograms per acre, which will seriously affect the development of Chinese cabbage and reduce yield and quality.
Six, avoid spraying high concentrations of nitrogen fertilizer
The solution of urea or ammonium sulfate is sprayed on the leaves of Chinese cabbage. Although it can make the leaves green and glossy and increase the yield significantly, the nitrate content in the plants will also increase significantly, affecting human health.
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