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Breeding for magnesium calcium potassium and phosphorus content in tall fescue


Breeding for magnesium calcium potassium and phosphorus content in tall fescue



Crop Science 17(3): 433-438



ISSN/ISBN: 0011-183X

A study was made to measure the heritability of the accumulation of Mg, Ca, K, P, and a ratio, K/(Ca + Mg), and their interrelationships in tall fescue (Festuca arundinacea Schreb.). Two diallel mating sets, each with 6 parents, were randomized and planted in 1 experiment. Forage was analyzed for Mg, Ca, K, P, and K/(Ca + Mg) for 3 harvest dates in 1974 and in 1975. Parents and progenies differed significantly for all minerals studied except that progenies were not significantly different for K in one of the diallel sets for the first harvest date. Estimates of general combining ability were more important than estimates of specific combining ability in the inherited uptake of these minerals. Heritability values calculated by the progeny-parent regression and standard unit method indicated that progress can be made in breeding for higher mineral levels of most minerals at most harvest dates. Since the K/(Ca + Mg) ratio was highly heritable, progress in breeding a tall fescue with low hypomagnesmia potential should be possible. Correlation of Mg between years was highly significant in one diallel but not in the other. Correlation of K/(Ca + Mg) between years was highly significant at all sampling dates for both diallels. Correlations coefficients between years for Ca, K and P were more erratic.

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Accession: 004859233

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