Vegetable top-dressing is very critical. It stresses the right amount of time, the amount of fertilizer, the type of vegetables, and the ratio of vegetable to vegetable in different periods. It cannot be one-sided in the pursuit of the amount of fertilizer, as long as the amount of fertilizer is large, it must be high-yield. The overall principle is to use nitrogen fertilizer and phosphorus fertilizer to promote the growth of the early plant and root development, and potassium fertilizer promotes fruit growth.
The total demand of leafy vegetables is not large, mainly nitrogen fertilizer. In the seedling stage, the amount of fertilizer required is very small, and it is not possible to top-dress fertilizer. After enter into the growth stage, humic acid, amino acids and a large number of balanced water-soluble fertilizers can be used to supplement nitrogen fertilizer, and the branches and leaves are tender and green. After entering the middle and late stages, phosphorus and potassium fertilizers can be properly added to enhance stem toughness, promote root development, increase overall weight, and prevent plant lodging.
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