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Foliar feeding is a technique of feeding plants by applying liquid fertilizer directly to their leaves.[1] It has been known for many years that plants are able to absorb essential elements through their leaves. The absorption takes place through the stomata of the leaves and also through the epidermis. Movement of elements is usually faster through the stomata, but the total absorption may be as great through the epidermis. Plants are also able to absorb nutrients through their bark.
http://en.wikipedia.org/wiki/Foliar_feeding

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