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Predicting Yields from Associated Characters in Medicago sativa L.¹

The F₁ progenies of eight clones of Medicago sativa crosed in all combinations and the polycross progenies of the eight clones were seeded in 10-foot rows. Coefficients of determination for multiple regression of dry weight of plants on July 21 and September 6 with characters associated with dry weight (height, width, stand, % leaves, and Leptosphaerulina leafspot) varied from 0.61 to 0.68 when calculated on an individual plot basis. Predictive equations were generated for both dates using F₁ and polycross data. Correlation coefficients calculated on means between F₁ observed and predicted yield were 0.89 and 0.90, respectively, for July 21 and September 6 harvest, using the predictive equation generated from F₁ data. The correlations between F₁ observed and predicted yields were 0.89 and 0.92, respectively, for the July 21 and September 6 harvest, using the predictive equation generated from the polycross data. Selection based on the variables associated with dry weight would be 96% and 109% as effective as selection based on actual dry weight for the July 21 and September 6 harvest respectively.

² Professor of Agronomy and former Graduate Research Assistant, now Director of Research, Farmers Forage Research, Lafayette, Ind.

Received for publication April 16, 1966.