Abstract
Abstract Significant varietal differences in plant nutrient content have been reported in the literature which would make extremely difficult the interpretation of plant analysis results for diagnosing plant nutritional problems. This investigation was conducted to analyze a relatively large number of uniformly fertilized commercially grown corn (Zea mays) varieties for possible differences in N, P, K, Ca, and Mg concentrations. Whole young plants 60 to 90 cm tall and ear leaves collected at tassel ling were chemically analyzed. Varietal differences in the concentrations of N, P, K, and Ca in field corn were statistically significant. Varietal differences in Mg concentrations were significant in three out of the six sets of data. In spite of statistical significance, plant nutrient concentrations were found to be within expected limits for the morphological parts and growth stages examined except for ear leaf P levels in two varieties. These varieties (P.A.G. SX 29 and Pioneer 3304) apparently were capabl...
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