Abstract
AbstractGrowth chamber experiments, employing a two‐zone root technique and nutrient solutions, were conducted to study the influence of iron on the growth of Linum usitatissimum L., fiber flax, at various levels of zinc sulfate. Zinc and iron variables were added to one root zone, while all other essential nutrients were added to a second root zone. Plant growth in nutrient solutions containing as much as 1.00 ppm of Zn was increased by the addition of 5.0 ppm of iron as FeCl3. Competition for root absorption sites existed between Zn+2 and Fe+3. Zinc appeared to interfere with iron uptake, whereas iron did not interfere with zinc uptake. FeEDDHA (sodium ferric ethylenediamine di‐[o‐hydroxyphenylacetate]) and Rayplex Fe (iron complexed with modified polyflavonoid copolymers) also increased plant growth in solutions containing 0.50 ppm zinc.
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