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Abstract
Sorghum [Sorghum bicolor (L.) Moench] is quite sensitive to acid soil stress, but differentially responsive genotypes have been found. To learn more about the overall acid soil tolerance mechanism(s), four genotypes differing in acid soil tolerance/susceptibility were evaluated for nutrient content and grain yield at three locations during 1983 to 1985. Plants were grown on soil pH >6.0 and <4.8. SC283, the most tolerant genotype, accumulated higher levels of Cu, Mn, Ca, and Mg as well as lower levels of K than the other genotypes. Aluminum concentration was identical in leaves collected from both soil pH treatments. Relative yields (yield pH <4.8 ÷ db yield pH >6.0 x 100) were 96% for SC283, 40% for SC599 (moderately susceptible), and 19 and 14% for RTx430 and TAM 428 (susceptible genotypes), respectively. Mechanisms involving Ca, Mg, and K may be important links in the overall acid soil tolerance mechanism of sorghum.