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Physiological Aspects of Iron-Phosphorus Nutrition in Two Varieties of Maize: I. Uptake and Accumulation Characteristics Under Greenhouse and Field Conditions¹

ABSTRACT

Two varieties of corn (Zea mays L.) showed differences in efficiency of Fe utilization when grown in hydroponic solutions and under field conditions. Under hydroponic conditions, ‘Seneca XX155’ showed greater susceptibility to P-induced Fe stress than ‘Wisconsin 335A’, although its foliage contained more Fe. This susceptibility was related to reduced Fe translocation caused by relatively high P concentrations. Levels of P > 22 ppm in the nutrient solution produced significant reduction in foliage Fe of both varieties. Field studies showed significant reduction of tissue Fe at a fertilization level of 50 kg/ha compared to controls. Unlike results from hydroponic studies, no change in Fe status occurred at progressively higher rates of applied P (50–400 kg/ha) under field conditions. Levels of tissue Fe were never < 160 ppm following soil P applications.

¹ Published with the approval of the Director of the New Hampshire Agr. Exp. Sta. as Scientific Contribution No. 612.

² Assistant Professor and Graduate Assistant, Dep. of Plant Science Univ. of New Hampshire, Durham, New Hampshire, respectively.

Received for publication May 17, 1972. Accepted for publication November 13, 1972.