Correction of Mn Deficiency of Soybeans1

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Abstract
The objective of this study was to compare rates of Mn application and methods of Mn application to correct Mn deficiency of soybeans (Glycine max L.) in planting systems where no starter fertilizer is utilized. Field experiments were conducted at three locations in the Coastal Plain region to evaluate broadcast and foliar applications as well as band placement of granular Mn fertilizer in the row with seed. The latter application was accomplished by utilizing a conventional granular insecticid applicator. Soils studied in this investigation included two aquic hapludults and one typic quartzipsamment.Applications of 5.6, 11.2, and 16.8 kg Mn/ha bandplaced in the row with seed produced yield increases of soybeans on both limed and unlimed areas at one location. Soybean yield increases were obtained at this location from broadcast applications of 11.2, 22.4, and 44.8 kg Mn/ha on the unlimed soil, and from the 22.4 and 44.8 kg Mn/ha on the limed soil. A foliar treatment of 2.2 kg Mn/ha also produced grain yield increases. Only the 11.2 and 16.8 kg Mn/ha band‐placed with seed, and the 11.2 kg Mn/ha broadcast treatments on the limed soil gave soybean yield increases at a second location. Drought conditions prevailed at the third site and no soybeans emerged on the 11.2 and 16.8 kg Mn/ha bandplaced with seed treatments.In planting systems where conventional band placement of fertilizer is not practical, band placement of Mn in the row with seed can increase yields on soils supplying insufficient Mn for plant growth. Plant populations can be reduced by band placement of Mn in the row with seed under adverse moisture conditions. Broadcasting high rates of Mn or repeated foliar applications of Mn will also correct Mn deficiency of soybeans.