Genotype Variation in Nutrient Uptake Efficiency in Corn1

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Abstract
Information is lacking on the efficiency of nutrient use by corn (Zea mays L.) genotypes of varying maturity. The objective of this study was to characterize the nutrient accumulation of 12 corn genotypes of commercial importance and of varying maturity under field conditions. Relative maturity of the genotypes was established based on percent dry matter (% DM) of the plant tops after 115 days of growth. Significant variability occurred among the genotypes with respect to dry matter yield and accumulation of P, K, Ca, Mg, Fe, and Zn. Significant positive correlations existed between % DM and foliage P (concentration and content) indicating that higher P levels occurred in the earlier maturing genotypes. Genotypes also differed in dry weight production per gram of N, P, K, Ca and Mg absorbed; the relationship between P concentration and relative maturity of the genotypes was the most consistent. The efficiency of dry matter production per unit of P absorbed was greatest for the later maturing hybrids.

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