Distribution of physiologically inactive zinc in maize growing on a black earth soil

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Abstract
Physiologically inactive zinc occurred in the roots and leaves but not the stems of maize seedlings when grown for 30 days in pots on a black earth soil. Expanded leaves had very high zinc concentrations (60–200 µg/g), yet expressed symptoms of zinc deficiency, which indicated that most of the zinc in these tissues was inactive. By contrast, stem tissue, which was 36% leaf sheaths and 64% new leaves and meristems, contained low levels of zinc (17 µg/g) when unfertilized and normal levels (27 µg/g) when fertilized with 10 µg/g zinc. Stem growth indicated that this zinc was active. Fertilizer phosphorus (200 µg/g) induced phosphorus/zinc imbalance and inactivated zinc further in roots, certain expanded leaves, and the stem. Zinc and phosphorus deficiencies and zinc inactivation were prevented by fertilization with both zinc (10 µg/g) and phosphorus (200 µg/g). This system is proposed as a model for the study of chemical and biochemical forms of active and inactive zinc in maize.