Differential Magnesium Efficiency in Corn Inbreds: I. Dry-Matter Yields and Mineral Element Composition1
- R. B. Clark2
In nutrient solutions, the corn (Zea mays L.) inbred B57 grew considerably better at low Mg levels and was more Mg-efficient than the inbred Oh40B. B57 produced maximum dry-matter yields near 0.12mM of Mg whereas Oh40B continued to increase dry-matter up to 4.1mM of Mg. Roots of B57 contained lower Mg concentrations than roots of Oh40B at Mg levels below 1.2mM and slightly higher Mg concentrations at higher Mg levels. However, B57 leaves contained nearly twice as much Mg as Oh40B leaves did when plants were grown at the various Mg levels. With few exceptions, the root and leaf concentrations of the various essential mineral elements in both inbreds decreased as the Mg treatment increased. In nearly all plants, the decrease in B57 was greater at the lower levels of Mg than in Oh40B. Root concentrations of P, Mn, Fe, Cu, and Mo and leaf concentrations of Ca, P, Mn, Zn, B, and Cu were lower for B57 than for Oh40B. When B57 and Oh40B were grown together in the same container at various plant ratios and 0.062mM of Mg, B57 grew markedly better than Oh40B. The plant ratio did not significantly affect dry-matter yield and mineral element concentration in the roots and leaves of either inbred.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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