Abstract
A method is described by which the effect of chelated Fe can be compared with the effect of ionic Fe in nutrient solution cultures over a prolonged period of time. Plants are grown in two solutions in succession: the one containing all nutrient elements except Fe, the other one containing the Fe compound together with Ca(NO(3))(2). In experiments with soybeans (Glycine maxima (L.) Merr.) and with corn (Zea mays L.) it was shown that a 7-day cycle with the ratio of 4 days nutrient solution to 3 days Fe solution resulted in growth and Fe nutrition similar to plants grown with a normal nutrient solution.
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