Dr. H. B. Tukey – renowned plant researcher and
Head of Michigan State University’s Department of Horticulture
Michigan State College
“The value of foliar feeding was proven many years ago at Michigan State College by Dr. H. B. Tukey. The project used radioactive tagged nutrients to prove that plants absorb nutrients not only through the roots, but also through the foliage, the fruit, the twigs, the trunk and even the flowers. Plants can absorb nutrients 8 to 10 times more efficiently through their leaf surfaces than through their roots. When applying nutrients to the leaf, the nutrients move through the stomata downward through the plant–at the rate of about a foot an hour. When applying nutrients to the leaves in soluble forms, as much as 95 percent of what is applied may be used by the plant. If a similar amount is applied to the soil about 10 percent of it is available.”
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