Nutritional quality and yield of seedling alfalfa established with a barley companion crop and weeds |
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| Institution: | 1. Research Ecologist, US Dept of Agriculture–Agricultural Research Service–Rangeland Resources Research Unit, Cheyenne, WY 82009, USA;2. Research Leader, US Dept of Agriculture–Agricultural Research Service–Rangeland Resources Research Unit, Cheyenne, WY 82009, USA;3. Research Leader, US Dept of Agriculture–Agricultural Research Service–Northern Great Plains Research Laboratory, Mandan, ND 58554, USA;4. Research Animal Scientist, US Dept of Agriculture–Agricultural Research Service–Northern Great Plains Research Laboratory, Mandan, ND 58554, USA;5. Research Rangeland Management Specialist, US Dept of Agriculture–Agricultural Research Service–Northern Great Plains Research Laboratory, Mandan, ND 58554, USA;6. Research Ecologist, US Dept of Agriculture–Agricultural Research Service–Ft Keogh Livestock and Range Research Laboratory, Miles City, MT 59301, USA;7. Research Leader, US Dept of Agriculture–Agricultural Research Service–Ft Keogh Livestock and Range Research Laboratory, Miles City, MT 59301, USA;8. Postdoctoral Research Associate, Department of Agricultural and Applied Economics, University of Wyoming, Laramie, WY 82071, USA;9. Assistant Scientist, Catedra de Forrajicultura-IFEVA-Facultad de Agronomia Universidad de Buenos Aires-CONICET, CABA 1417, Argentina;1. Department of Wildland Resources, Utah State University, Logan, UT 84322, USA;2. The Ecology Center, Utah State University, Logan, UT 84322, USA;3. US Forest Service, Rocky Mountain Research Station, Shrub Science Laboratory, Provo, UT 84606, USA;4. Retired, US Department of Agriculture, Agricultural Research Service, Forage and Range Research Laboratory, Logan, UT 84322, USA;5. Department of Plant and Wildlife Science, Brigham Young University, Provo, UT 84602, USA;6. US Department of Agriculture, Agricultural Research Service, Forage and Range Research Laboratory, Logan, UT 84322, USA;7. US Department of Agriculture, Natural Resources Conservation Service, Aberdeen Plant Materials Center, Aberdeen, ID 83210, USA;8. School of Biological Sciences, University of Western Australia, Crawley, WA 6009, Australia;9. Kings Park Science, Department of Biodiversity Conservation and Attractions, Kings Park, WA 6005, Australia;10. Department of Biology, Pennsylvania State University, State College, PA 16801, USA;1. Ecologist, US Department of Agriculture–Agricultural Research Service, Fort Keogh Livestock and Range Research Laboratory, Miles City, MT 59301, USA;2. Assistant Professor, Texas A&M AgriLife Extension Service, San Angelo, TX 76901, USA;1. Research Technician, University of Nevada, Reno, Department of Natural Resources and Environmental Science, Reno, NV 89557, USA;2. Monitoring Specialist, Bureau of Land Management, Winnemucca District Office, Winnemucca, NV 89445, USA;3. Monitoring Specialist, Bureau of Land Management, Salt Lake Field Office, West Valley City, UT 84119, USA;4. Professor, University of Nevada, Reno, Department of Natural Resources and Environmental Science, Reno, NV 89557, USA;5. Spatial Analyst/Research Scientist, University of Nevada, Reno, Department of Natural Resources and Environmental Science, Reno, NV 89557, USA;6. Associate Professor, University of Nevada, Reno, Department of Natural Resources and Environmental Science, Reno, NV 89557, USA;1. Research Soil Scientist, US Department of Agriculture–Agricultural Research Service, Mandan, ND 58554, USA;2. Research Animal Scientist, US Department of Agriculture–Agricultural Research Service, Mandan, ND 58554, USA;3. Research Rangeland Management Specialist, US Department of Agriculture–Agricultural Research Service, Mandan, ND 58554, USA;4. Physical Scientist, US Department of Agriculture Forest Service, Rifle, CO 81650, USA;1. Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, USA;2. Fort Keogh Livestock and Range Research Laboratory, United States Department of Agriculture, Agricultural Research Service, 243 Fort Keogh Road, Miles City, MT 59301, USA |
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| Abstract: | Alfalfa (Medicago sativa L.) was established with barley (Hordeum vulgare L.) and weeds to determine the effect of weed management treatments on yield and nutritional quality of alfalfa and companion crop and weeds. Alfalfa+barley and alfalfa+wild oat (Avena fatua L.) had much higher yields in August of the first year than alfalfa alone. Total yields for the first three harvests were similar for alfalfa established weed free, with broad leaf weeds, wild oat or green foxtail (Setaria viridis L.). Protein contents in forage from the August harvest were 228, 196, 117 and 181 g/kg dry matter (DM) in weed free alfalfa, alfalfa plus broadleaf weeds, alfalfa plus wild oat, and alfalfa plus green foxtail, respectively. Alfalfa+barley had higher total in vitro gas production than pure alfalfa, which is correlated with the digestibility of the forage. Total in vitro gas production indicated that alfalfa+barley+weeds had slightly lower digestibility than weed free alfalfa+barley. However, alfalfa with a high percentage of redroot pigweed (Amaranthus retroflexus L.), wild oat or green foxtail had similar or higher in vitro gas production than pure alfalfa. The results from this experiment support a previous economic study that indicated herbicide application for weed control in seedling alfalfa was not necessary. |
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