A field experiment was conducted during the summer of 2007 at the Haskell Agricultural Laboratory near Concord, NE, to determine the response of four weeds species to broadcast flaming, including two grasses [barnyardgrass (Echinochloa crus-galli) and green foxtail (Setaria viridis)] and two broadleaves [velvetleaf (Abutilon theophrasti) and morningglory (Ipomoea hederacea)]. The V3 barnyardgrass (5 cm tall), V4 green foxtail (6 cm), V4 morningglory (11 cm) and V5 velvetleaf (8 cm) were flamed using propane rates of 0, 12, 31, 48, 69 and 87 kg/ha. The responses of the barnyardgrass, green foxtail, velvetleaf, and morningglory to propane flaming were described by logistic models. The percentage of weed control in terms of visual injury rating and dry matter (DM) reduction increased with increasing propane rates. In general, grasses were more tolerant to flaming than the broadleaf species when based on visual ratings. About 90% control of barnyardgrass was achieved with 55 kg/ha compared to 26 kg/ha for velvetleaf and morningglory. In contrast to visual ratings, the dose response curves based on DM showed that comparatively higher propane dose was needed to obtain 90% DM reduction in morningglory than the other species. For example, propane rate of 41 kg/ha was required to get 90% DM reduction in morningglory 14 days after treatment compared to 36, 20 and 24 kg/ha for barnyardgrass, green foxtail and velvetleaf, respectively. Broadcast flaming has good potential for the control of both grass and broadleaf weed species.
Domingues, Andre C.; Ulloa, Santiago M.; Datta, Avishek; and Knezevic, Stevan Z.
"Weed Response to Broadcast Flaming,"
RURALS: Review of Undergraduate Research in Agricultural and Life Sciences: Vol. 3
, Article 2.
Available at: http://digitalcommons.unl.edu/rurals/vol3/iss1/2