Development and validation of a hydroponic screening method to identify acid soil-adapted genotypes of the tropical forage grass Brachiaria - Wenzl, Peter; Arango Vélez, Adriana; Chávez, Alba L.; Buitrago González, M.E.; Patiño, G.M.; Miles, John W.; Rao, Idupulapati M. (International Center for Tropical Agriculture, 2007)