What are the characteristics of leaf nutrition? What are the advantages and disadvantages of foliar fertilization?

Experts: The main feature is that leaf nutrition provides nutrients more quickly than roots, but the amount is limited and the effect is short-lived. The efficiency of leaf nutrition is related to the leaf structure. The permeability of the leaves to mineral nutrients is low, especially in leaves with thick cuticles, such as leaves of olives, oranges, and coffee, fat drops do not easily seep through the leaves, and the drops of liquid fertilizer slip down from the leaves and cause losses. After spraying fertilizer, if it rains soon, the rain will lose the liquid fertilizer. Fertilizer spray will cause the fertilizer solution to dry quickly on the leaves in high wind days and high temperature days. These conditions may reduce the effect of foliar fertilization. In short, the advantages of foliar fertilization are: direct supply of nutrients, avoid the fixation and degradation of nutrients in the soil, nutrient use efficiency is higher than the soil fertilization. However, the technique of spraying fertilizer materials is more complicated and must be strictly controlled.

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