K.V. McCully1, M.J. Melanson1, and D.F.Walker2
(Partner: New Brunswick Soil and Crop Improvement Association)
Abstract: A trial to evaluate Roundup Transorb applied at various times, with other conventionlly used soybean herbicides were applied on Roundup Ready Soybeans grown in Hartland, NB. Visual ratings on crop injury and weed control were collected in addition to yields. Results indicated that Roundup Ready Soybeans grown in NB were very tolerant to Roundup Transorb regardless of application timing. A visible but slight reduction in crop height was observed early in the season from Broadstrike Dual and Pursuit+Basagran Forte+10-34-00, but injury was short-lived. Yields between all treatments varied but were not significantly different from each other. Differences in kg per hectolitre and hundred seed weights were also not significant. Wild buckwheat was the most predominant weed, followed by corn spurry, and chickweed. The larger the buckwheat the more difficult it was to control with Roundup Transorb. This was also true for chickweed and corn spurry. By the final rating taken on September 9, all weeds had died down giving 100% control. Weeds were not able to survive the herbicide/soybean canopy combination. The importance of the heavy shading from the soybean canopy along with the Roundup treatments will play an important part in a successful soybean weed control program.
1Potato and Horticulture Branch, NBDARD, Fredericton, NB E3B 5H1
2Livestock and Livestock Feed Branch, NBDARD, Fredericton, NB, E3B 5H1