The top-dressing fertilizer is a fertilization method in which the dilution of chemical fertilizers or trace elements is sprayed on the leaves and the leaf pores are absorbed and utilized by the plants. Therefore, it is also called foliar fertilizer.
The advantages of dressing fertilizers outside the roots are: the amount of fertilizer is small, the fertilizer effect is rapid and significant, and the fertilizer is not fixed by the soil and is not affected by the root absorption function.
Inorganic fertilizers are usually sprayed on the foliage, and can be absorbed within 5 hours after spraying. It can be absorbed by 50%-75% within 24 hours, and the fertilizer effect lasts 7-10 days. Therefore, it is appropriate to spray the fertilizer 7-10 days out of the root. .
In addition to the flowering period, extra-root topdressing can be carried out at other times, but extra-root topdressing is often performed when flowering trees grow vigorously or lack certain elements.
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