Abstract: Research was conducted in 1997 and 1998 to evaluate narrow row spacing and glufosinate in glufosinate-resistant corn. Glufosinate-resistant corn was planted in 51- and 102-cm row spacings at the same plant populations. Herbicide treatments included glufosinate alone and in different herbicide combinations. Atrazine plus glufosinate enhanced Palmer amaranth control compared to glufosinate alone. Control of johnsongrass, ivyleaf morningglory, entireleaf morningglory, Texas panicum, smellmellon, browntop panicum, and toothed spurge with glufosinate was greater than 82%. Common sunflower control with glufosinate was greater than 95%. Atrazine followed by glufosinate applications provided at least 94% control of all species and was the most consistent herbicide system used. Row spacing had little effect on weed control. Crop injury to glufosinate-resistant corn was minimal with glufosinate and atrazine plus glufosinate combinations.
Nomenclature: Atrazine; glufosinate; browntop panicum Panicum fasciculatum Sw. #3 PANFA; entireleaf morningglory Ipomoea hederacea var. intergriuscula Gray # IPOHG; ivyleaf morningglory Ipomoea hederacea (L.) Jacq. # IPOHE; johnsongrass Sorghum halepense (L.) Pers. # SORHA; Palmer amaranth Amaranthus palmeri S.Wats. # AMAPA; smellmellon Cucumis melo L. var. dudaim Naud. # CUMMD; common sunflower Heliathus annuus L. # HELAN; Texas panicum Panicum texanum Buckl. # PANTE; toothed spurge Euphorbia dentata Michx. # EPHDE; corn (Zea mays L.).
Additional index words: Narrow-row corn, transgenic corn, atrazine, pendimethalin, primisulfuron, CGA 152005 (proposed name, prosulfuron).
Abbreviations: DAT, days after POST treatment; fb, followed by; LPOST, late postemergence; POST, postemergence; PRE, preemergence.
