Influence of Application Variables on Efficacy of Manganese-Containing Fertilizers Applied to Peanut (Arachis hypogaea L.)

Abstract Several formulations of the essential element manganese (Mn) are commercially available for application to peanut (Arachis hypogaea L.). Research was conducted in North Carolina to compare accumulation of Mn in peanut leaves, stems, and pods following application of water soluble manganese sulfate including 17.5% Mn (Techmangum® or Man-Gro DF®) and liquid Mn formulations including 5.0% Mn (Manganese Xtra©) or 8% Mn (Nutrisol 8% Manganese™). Experiments were also conducted to determine the influence of herbicides, adjuvants, and selected fungicide and insecticide combinations on Mn accumulation in peanut leaves. A second experiment was conducted to determine if efficacy of clethodim, imazapic, imazethapyr, lactofen, sethoxydim, and 2,4-DB was affected by Mn formulations when applied in mixture. Experiments were also conducted to determine the effect of Mn on efficacy of the fungicides azoxystrobin, chlorothalonil, pyraclostrobin, and tebuconazole. More Mn was found in leaves when dry formulations ...