Corn Weed Management Studies

Materials and Methods The studies were established using a randomized complete block design with three or four replications. Herbicide evaluation plot size was 10 ft by 25 ft. For studies that included yield evaluation the plot size was 15 ft by 25 ft. Herbicides were applied in 20 gallons of water per acre. Visual estimates of percentage weed control and crop injury data were made throughout June and July. Weed control observations are compared with an untreated control and made on a zero to 100 rating scale with zero percent equaling no weed control. Crop injury ratings are on a 0 to 100 rating scale, with 0 representing no crop injury. Weed species and populations evaluated included: 50 to 100 foxtail, 30 to 75 waterhemp and two to ten lambsquarters, Pennsylvania smartweed, and velvetleaf/ft.