Integrated johnsongrass (Sorghum halepense) management in field corn (Zea mays) with reduced rates of nicosulfuron and cultivation

Johnsongrass, a tall, coarse, perennial grass, is the second most common an d troublesome weed in field corn in Texas. Field experiments were conducted in 1996 to 1998 to evaluate an integrated johnsongrass management program in bedded and irrigated field corn. Nicosulfuron at 26.3 g ai/ha applied ba nded over the row to 50% of the planted area plus one cultivation resulted in johnsongrass control of aboveground and rhizome biomass and in corn yiel d comparable to the labeled rate (35 g ai/ha) when applied two consecutive years in the same plots. This treatment reduced cost 27% and reduced herbic ide input 62% compared to nicosulfuron applied broadcast at labeled rate wi thout cultivation. Economic benefits of this johnsongrass management progra m are promising for field corn producers.