Effects of Herbicide, Application Rate and Growth Stage on Spring Wheat Yield and Kernel Quality
Thesis - University Access Only
Master of Science (MS)
Department / School
Leon J. Wrage
Due to importance of spring wheat production and continued use of weed control, a study was developed to determine the effects of five herbicides (routinely used in South Dakota for grass or broadleaf control) on grain yield and seed quality. Herbicides were applied at two rates and three growth stages. Traditional high and low yielding environments were selected as a means to evaluate the impact of stress factors. Primary tillers and secondary tillers were separated and yield components were investigated to determine how the wheat plant compensates if herbicide injury occurred. Data collected was grain yield, percent protein, kernel weight, volume weight, primary and secondary tiller height, primary and secondary spikelets/spike, primary and secondary kernels/spikelet, and productive secondary tillers/plant. All herbicides in this study showed no reduction in yield when applied at the labeled recommended rate and growth stage. There was a positive correlation between grain yield and primary and secondary tiller height, an exception was dicamba. Kernels/spike, had compensating effects on grain yield, but productive tillers/plant or number of productive spikes/unit area had the largest influence on grain yield. At the low yielding environment, two herbicides applied earlier than the recommended growth stage reduced productive tillers/plant due to added stress, but did not significantly reduce the kernels/spikelet. At the higher yield location, kernels/spikelet had less compensating affects [sic] on yield than the low yield potential when compared to the weed free check. One herbicide had no negative affects [sic] on any yield component or agronomic trait measured.
Library of Congress Subject Headings
Wheat -- Yields -- South Dakota
Wheat -- South Dakota -- Seeds -- Quality
Wheat -- Weed control -- South Dakota
Plants, Effect of herbicides on
South Dakota State University
Langner, Charles L., "Effects of Herbicide, Application Rate and Growth Stage on Spring Wheat Yield and Kernel Quality" (1994). Electronic Theses and Dissertations. 70.