Evaluation of glyphosate-resistant hard red spring wheat (Triticum aestivum).

摘要

The potential for future commercialization of glyphosate-resistant wheat necessitates evaluation of agronomic merits of this technology. Experiments were established to evaluate glyphosate-resistant wheat and weed responses to glyphosate rate, application timing, and tank mixtures. Glyphosate at 1680 g/ha did not injure wheat. Wheat response to glyphosate applied during the 1- to 3- or 3- to 5-leaf stage of the crop was not different from that of untreated wheat. Wheat was injured more from glyphosate applied in combination with thifensulfuron or dicamba than from individual herbicides at one of 6 locations, but grain yield was not affected by glyphosate tank mixtures. Glyphosate application timing did not affect the control of wild oat or common lambsquarters (Chenopodium album) 56 days after the treatment. Glyphosate, when applied during the 1- to 3-leaf stage of the crop provided better control of wild buckwheat (Fallopia convolvulus) than later glyphosate application, whereas glyphosate applied during the 3- to 5-leaf stage provided the best control of green foxtail (Setaria viridis), yellow foxtail (S. pumila), redroot pigweed (Amaranthus retroflexus), and Canada thistle (Cirsium arvense). Weed control with glyphosate tended to be better than conventional herbicides, and wheat treated with glyphosate produced approximately 10% more grain than wheat treated with conventional herbicide tank mixes..