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Mineral Concentration in Two Tall Fescue Genotypes Grown under Variable Soil Nutrient Levels¹

Grass tetany is a disease that affects cattle and sheep. Information is needed to determine if soil treatments can alter mineral concentration in the herbage. Two tall fescue genotypes (Festuca arundinacea Schreb.) B17-42 and B5-62, which differ in their genetic ability to accumulate Mg were grown under different K and Mg levels in the greenhouse. Experiments were conducted to test the hypothesis that the genetic differences to accumulate Mg could be altered by soil fertility treatments. Potassium was added at a rate of 50, 150, and 250 ppm while Mg was added at a rate of 0, 90, to a Mexico soil (Udollic Ochraqualf) and 230 ppm to a Keeno soil (Mollic Fragiudalf) growing both tall fescue genotypes. Genotype B5-62 had the highest Mg concentration for all treatments. Genotypes growing. on the Mexico soil contained more herbage Mg than those growing on the Keeno soil. Initial soil tests showed that the Mexico soil contained 234 pprn of Mg while the Keeno soil contained only 73 ppm Mg. Applied K or Mg soil treatments did not eliminate the ability of B5-62 to accumulate more Mg than B17-42.

Key Words: Potassium • Magnesium • K/(Ca+Mg) • Grass tetany • Festuca arundinacea Schreb

² Professor and associate professor of Agronomy. Univ. of Missouri, Columbia, MO 65211.

Received for publication November 20, 1979.

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