If you fertilise at 1/8 the recommended soil fertilisation rate, that would make it 1/40 the recommended foliar rate.
In relation to increased fertilisation through the roots, I have read it from several sources. It is explained here in point 9. Point 3 talks about the increased numbers of stomata on the bottom sides of the leaf.
http://www.nutri-tech.com.au/blog/2010/03/top-10-most-frequently-asked-foliar-fertilising-questions/
Some more useful information from these sites -
http://www.spraygro.com.au/foliar_feeding.asp
http://www.ecochem.com/t_foliar.html
David, what wetting agent are you using?
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