Influence of Humic Acids on Plant Growth

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Abstract
Iron chlorosis was prevented by the addition of the ferric chelate of ethylenediamine tetraacetic acid (EDTA) as in a divided root culture with iron and phosphate in the other compartment. Water extract of peat or lignite or humus-like substances synthesized from "A.R." sucrose were equally effective and plants became chlorotic if the humic water was withheld and iron translocation to the leaves failed.