Publication Date

1989

Description

Acid soils and their related toxicities are found in every con­tinent of the world. Since liming and fertilization rarely over­come subsoil acidity, poor rooting usually results when grow­ing sensitive legumes such as alfalfa ( Medicago sativa L.). Subsoil liming increased alfalfa yield 46 % over conventionally limed controls indicating deeper rooting achieved through an ability to overcome subsoil toxicity significantly enhanced stand life and productivity (Bouton et al., 1986). If acid soil tol­erance could be incorporated into new multiple-pest resistant cul ti vars without loss of their desirable traits, farmers may real­ize the benefits of any new alfalfa cultivar. The purpose of this investigation therefore was to determine the success of recurrent selection for developing acid soil toler­ant alfalfa by monitoring changes in forage yield and disease resistance as well as acid soil tolerance.

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Effects of Acid Soil Selection on Agronomically Important Traits in Alfalfa

Acid soils and their related toxicities are found in every con­tinent of the world. Since liming and fertilization rarely over­come subsoil acidity, poor rooting usually results when grow­ing sensitive legumes such as alfalfa ( Medicago sativa L.). Subsoil liming increased alfalfa yield 46 % over conventionally limed controls indicating deeper rooting achieved through an ability to overcome subsoil toxicity significantly enhanced stand life and productivity (Bouton et al., 1986). If acid soil tol­erance could be incorporated into new multiple-pest resistant cul ti vars without loss of their desirable traits, farmers may real­ize the benefits of any new alfalfa cultivar. The purpose of this investigation therefore was to determine the success of recurrent selection for developing acid soil toler­ant alfalfa by monitoring changes in forage yield and disease resistance as well as acid soil tolerance.