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Genotype Variation in Nutrient Uptake Efficiency in Corn¹

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 commxcial importance and of varying maturity under field conditions. Relative maturity of the genotypes was established based on percent dry matter (yo 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 yo 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.

Key Words: Zea mays L. • Maturity

² Formerly research assistant and associate professor, respectively, Dep. of Plant Science, Univ. of New Hampshire, Durham, NH 03824. The senior author is now assistant professor, Dep. of Plant Science, State Univ. Agric. and Tech. Inst., Cobleskill, N.Y.

Received for publication June 11, 1974.

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