Application of manganese fertilizer with postemergence soybean herbicides

Soybean [Glycine mar (L.) Merr.] grown on Mn deficient soils typically exhi bits symptoms of Mn deficiency as inter-veinal chlorosis during early veget ative growth. Manganese sulfate is commonly applied as a foliar spray to co rrect the deficiency. The need for foliar applied Mn often coincides with t he timing of postemergence herbicide application. The feasibility of tank m ixing manganese sulfate with postemergence herbicides was evaluated on Mn-d eficient Holmdel sandy loams (fine-loamy, mixed, mesic Aquic hapludult) nea r Adelphia, NJ, and Mn-sufficient Sassafras sandy loams (fine loamy, silice ous, mesic Typic Hapuldult) near Bridgeton, NJ, to study crop nutrition and weed control interactions. Manganese sulfate was foliar applied at growth stage V3 at 0, 0.5, and 2.0 lb Mn/acre alone or tank mixed with the herbici des acifluofen, chlorimuron ethyl, imazethapyr, and bentazon. Maturity grou p IV cultivars Midstates 395 and Agripro 4100 were grown at Adelphia and Br idgeton, respectively. Application of manganese sulfate alone or tank-mixed with herbicides did not influence the effectiveness of manganese sulfate t o correct Mn deficiency. The 2.0 Ib Mn/acre rate generally increased plant tissue Mn more effectively and alleviated Mn deficiency more completely tha n the 0.5 Ih Mn rate. The addition of manganese sulfate to postemergence he rbicides did not influence crop injury or weed control.