K.V. McCully1, M. Melanson 1, N. Pothier1 and D.F. Walker2
(Partners: New Brunswick Soil and Crop Improvement Association and Monsanto)
Abstract: A trial to evaluate Roundup Transorb applied at various soybean growth stages, with other conventionlly used soybean herbicides were applied on Roundup Ready Soybeans (2601R) grown in Hartland, NB. Visual ratings on crop injury and weed control were collected, as well as yield data. Results indicated that Roundup Ready Soybeans grown in NB were very tolerant to Roundup Transorb regardless of application timing, as injury never exceeded 4% from any of the Roundup Transorb treatments. Roundup Ready Soybeans were also very tolerant to the two standard treatments of Sencor + Dual II Magnum, and Lorox + Dual II Magnum. All the herbicide treatments provided excellent lamb's quarters and wild buckwheat control by the end of the season. Yield data indicated that all the herbicide treatments provided significantly higher yields than the untreated control. Yields for the herbicide treated plots ranged from 3.0 to 3.6 T/ha, but were not significantly different from each other. The untreated control yielded 1.1 T/ha. Overall, Roundup Ready soybeans were found to be extremely tolerant to all the Roundup Transorb treatments and the two standard treatments (Sencor + Dual II Magnum and Lorox + Dual II Magnum). In addition, all the herbicides provided excellent weed control even when applied to larger than recommended weeds.
1Potato and Horticulture Branch, NBDARD, Fredericton, NB E3B 5H1
2Livestock and Livestock Feed Branch, NBDARD, Fredericton, NB