Micronutrient Uptake and Mobility Within Corn Plants (Zea mays L.) in Relation to Phosphorus-induced Zinc Deficiency
1970
Warnock, R. E.
Corn plants (Zea mays L.) were grown in greenhouse pots on calcareous soil known to be low in available Zn. Phosphorus was applied to soil at rates of 0 to 520 ppm with concomittant addition of Zn decreasing from 40 to 0 ppm—in inverse concentration. Zinc deficiency occurred at high P and low Zn. Maximum growth occurred at 130 ppm P and 2.5 ppm Zn applied. Distribution of Zn, Fe and Mn among leaf, stem and root tissue indicated that P and Zn fertilization had altered the mobility of these micronutrients within the plant. Mobility of Fe and Mn was increased by high P and low Zn. Zinc mobility varied opposite to that of Fe and Mn. Applied P reduced Zn concentration in tissue but not uptake per plant. DTPA-extractable Zn in soil was not decreased by P applied, but did increase with Zn applied. DTPA-extractable Fe and Mn increased at high levels of applied P. Zinc-deficient plants accumulated a large excess of Fe. Interference from excess Fe is suggested as contributing to physiological malfunction within Zn-deficient corn plants.
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