Screening sorghum for tolerance to excess manganese in solution culture

Sorghum growth, root responses, and soil‐solution aluminum and manganese on pH‐stratified sandy soil§

“…In the current study, concentrations up to 18 mg L -1 were reached by 42 d, distinctly higher than those found by Robson and Loneragan (1970), but also lower than the concentration suggested by Bromfield et al (1983). Mgema and Clark (1993) found toxic response to Mn 2+ concentrations in nutrient solution beginning at 165 mg L -1 and nearly complete death of sorghum plants with concentrations reaching 490 mg Mn 2+ L -1 . Among various sorghum cultivars, Mgema and Clark (1995) found a wide range of responses to Mn 2+ concentrations, the range spreading from a 10.6% to 70.9% reduction in plant biomass at Mn concentrations of 165 mg L -1 .…”