Abstract
A field experiment was initiated in 1977 to evaluate soybean (Glycine max (L.) Merr.) response to rates of broadcast Mn and was continued in 1978 to determine the residual effects of applied Mn. This study was conducted on a Dragston fine sandy loam soil with an initial pH of 6.0 and 2.5% organic matter. In 1977 the 40kg Mn/ha rate increased seed yields by 900 kg/ha and raised leaf tissue Mn concentration from 10.3 to 16.1 μg Mn/g. Residual Mn increased seed yield and leaf Mn concentration. Reapplied Mn produced higher yields and tissue Mn levels than the residual Mn. The Mitscherlich plant growth model r=0.67**, fit the relationship between yield and leaf Mn concentration. Double acid extractable Mn in soil sampled in 1978 was linearly related to broadcast Mn and soybean yields. Applied Mn increased Mn concentrations of soybean seed parts by 97%, 182% and 109% in the cotyledon, embryo and seedcoat, respectively.
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