Abstract
A study was conducted to evaluated response of four soybean genotypes to different soil pH conditions, and rates of manganese application. Enon sandy loam soil was used for the investigation in a greenhouse. Manganese rates were 0, 10, and 20 Kg Mn ha. The pH levels were 5.3, 6.3, and 7.0. The genotypes tested were PI 159319, PI 324924, PI 960895, and L-76-0132. Genotype PI 960895 gave the highest yield whereas I-76-0132 gave the lowest yield. Genotype PI 324924 showed normal plant growth and higher yield at pH 5.3 indicating its tolerance to low soil pH. Soil pH 5.3 resulted in highest concentration of Mn in the leaves. Relatively lower seed yield of PI 159319 at pH 5.3 was due to intolerance to low soil pH. Genotypes PI 960895 and L-76-0132 gave similar seed yields at all pH levels. Genotypes PI 159319 responded to Mn addition while the others did not. The data suggest differential response by soybean genotypes to soil pH and Mn addition.
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