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How do plants intake the fertilizer when it is sprayed all over the leaf surface as a foliar feed?

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They absorb minerals through pores in the leaves known as stomata, this is some what similar to the way a medicine patch is absorbed on human skin except for the fact that the human skin has sweat pores instead of stomata.

Here is a animation of them opening and closing on a tomato plant provided by Wikipedia:

sources:

A nice review by Wocjik (2004) (from the comments)

http://www.wisegeek.com/what-is-foliar-feeding.htm

http://en.wikipedia.org/wiki/Foliar_feeding

http://cronodon.com/BioTech/Plant_Transport.html

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