Growth of soybean [Glycine max (L.) Merr.] roots into acid subsoils and utilization of subsoil
moisture is limited in many soils of the southeastern US because of Al toxicity. Laboratory
and greenhouse experiments were conducted to obtain information on tolerance of soybean
cultivars which would be helpful in selection of cultivars best adapted to acid subsoils. Root
elongation measurements were made of 18 cultivars exposed for 48 hours to solutions
containing 0, 0.25, 0.50, and 1.0 ppm Al and 10 ppm Ca. Eleven of the cultivars were …