Research Centers
Permanent URI for this communityhttps://scholarworks.montana.edu/handle/1/13
The Department of Research Centers was created in 1994. The Department represents the faculty and staff that conduct research and outreach programs at 7 off-campus research centers.
Central Agricultural Research Center
Eastern Agricultural Research Center
Northern Agricultural Research Center
Northwestern Agricultural Research Center
Southern Agricultural Research Center
Western Agricultural Research Center
Western Triangle Ag Research Center
Central Agricultural Research Center
Eastern Agricultural Research Center
Northern Agricultural Research Center
Northwestern Agricultural Research Center
Southern Agricultural Research Center
Western Agricultural Research Center
Western Triangle Ag Research Center
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Item Crop water use and stage-specific crop coefficients for irrigated cotton in the mid-south, United States(2015-07) Kumar, Vipan; Udeigwe, Theophilus K.; Clawson, Ernest L.; Rohli, Robert; Miller, Donnie K.Regional variations in environmental conditions, cultivars, and management practices necessitate locally derived tools for crop water use estimation and irrigation scheduling. A study was conducted in northeast Louisiana (mid-south US) aimed at estimating daily crop evapotranspiration (ETc) and reference evapotranspiration (ETo) and thus, developing local crop coefficient (Kc) curves for irrigated upland cotton. ETc was determined using paired weighing lysimeters installed near the middle of a 1-ha cotton field and planted with cotton as in the rest of the surrounding field, while ETo was calculated using the Standardized Reference Evapotranspiration Equation (SREE) developed by the American Society of Civil Engineers (ASCE), using estimates of weather variables from a nearby standard reference weather station. Stage-specific Kc values averaged over 2 years were 0.42, 1.25 and 0.70 for initial, midseason, and end season stages of cotton, respectively. The initial-stage Kc value was approximately 26% lower than the Food and Agricultural Organization (FAO)-adjusted initial Kc value. The mid- and end-season Kc values obtained in the study were approximately 6% and 11% greater, respectively, than the FAO-adjusted Kc values for the corresponding stages. The observed differences among the local stage-specific Kc values (especially at initial growth stage of cotton) and the FAO-adjusted initial Kc values could be attributed to regional variations in environmental conditions, cultivars, and management practices. The ETc and Kc values obtained from this study provide research-based information for future studies and the development of Kc-based irrigation tools in this region.Item Control of Volunteer Glyphosate-Resistant Canola in Glyphosate-Resistant Sugar Beet(2015-03) Kumar, Vipan; Prashant, JhaOccurrence of glyphosate-resistant (GR) canola volunteers in GR sugar beet is a management concern for growers in the Northern Great Plains. Field experiments were conducted at the Southern Agricultural Research Center near Huntley, MT, in 2011 and 2012 to evaluate effective herbicide programs to control volunteer GR canola in GR sugar beet. Single POST application of triflusulfuron methyl alone at the two-leaf stage of sugar beet was more effective at 35 compared with 17.5 g ai ha 1. However, rate differences were not evident when triflusulfuron methyl was applied as a sequential POST (two-leaf followed by [fb] six-leaf stage of sugar beet) program (17.5 fb 17.5 or 35 fb 35 g ha 1). Volunteer GR canola plants in the sequential POST triflusulfuron methyl–containing treatments produced little biomass (11 to 15% of nontreated plots) but a significant amount of seeds (160 to 661 seeds m 2). Ethofumesate (4,200 g ai ha 1) PRE followed by sequential POST triflusulfuron methyl (17.5 or 35 g ha 1) provided effective control (94 to 98% at 30 d after treatment [DAT]), biomass reduction (97%), and seed prevention of volunteer GR canola. There was no additional advantage of adding either desmedipham þ phenmedipham þ ethofumesate premix (44.7 g ha 1) or ethofumesate (140 g ha 1) to the sequential POST triflusulfuron methyl– only treatments. The sequential POST ethofumesate-only (140 fb 140 g ha 1) treatment provided poor volunteer GR canola control at 30 DAT, and the noncontrolled plants produced 6,361 seeds m 2, which was comparable to the nontreated control (7,593 seeds m 2). Sequential POST triflusulfuron methyl–containing treatments reduced GR sugar beet root and sucrose yields to 18 and 20%, respectively. Consistent with GR canola control, sugar beet root and sucrose yields were highest (95 and 91% of hand-weeded plots, respectively) when the sequential POST triflusulfuron methyl– containing treatments were preceded by ethofumesate (4,200 g ha 1) PRE. Growers should utilize these effective herbicide programs to control volunteer GR canola in GR sugar beet. Because of high canola seed production potential, as evident from this research, control efforts should be aimed at preventing seed bank replenishment of the GR canola volunteers. Nomenclature: Desmedipham; ethofumesate; glyphosate; phenmedipham; triflusulfuron methyl; canola, Brassica napus L.; sugar beet, Beta vulgaris L. Key words: Crop volunteer, glyphosate-resistant canola, glyphosate-resistant sugar beet, herbicide efficacy.