Submitted to: Columbia Basin Agricultural Research Annual Report
Publication Type: Experiment Station
Publication Acceptance Date: 5/1/2005
Publication Date: 6/1/2005
Citation: Machado, S., Rhinhart, K., Petrie, S., Wuest, S.B., Correa, R.F., Johlke, T.R. 2005. Long-term experiments at CBARC-Pendleton, 2004. In 2005 Dryland Agricultural Research Annual Report, p.73-87. DA. Long, S.E. Petrie and P.M. Frank, eds. SR 1061. Corvallis, OR: Oregon State Univeristy Agric. Exp. Station in cooperation with USDA-ARS, Pendleton, OR. Interpretive Summary: The Columbia Basin Agricultural Research Center is home to the oldest experiments in the Pacific Northwest, the earliest being started in 1931. Long-term research guides future agricultural development by identifying the effects of crop rotation, variety development, fertilizer use, aerial and surface contamination, and organic amendments on soil productivity and other beneficial soil properties. This report describes treatments history and yields for the seven on-going long-term experiments.
Technical Abstract: The Columbia Basin Agricultural Research Center (CBARC) is home to the oldest experiments in the Pacific Northwest (PNW). The perennial grassland, conventional-till continuous cereal, and crop residue management experiments were initiated in 1931, and the tillage-fertility, wheat-pea rotation experiments were initiated in 1940 and 1963. In 1998, a no-till continuous cereal was added to mirror the conventional-till continuous cereal. This article summarizes the results obtained in 2004. The perennial grassland serves as a baseline for comparisons with other systems. Continuous cereal: in both conventional and no-till cropping systems, spring barley produced the highest yield, followed by winter wheat and then spring wheat. Winter wheat, spring barley, and spring wheat produced higher yields under conventional tillage than under the no-till cropping system. Crop residue: highest yields were obtained when manure was applied, followed by 80-lb nitrogen (N) rates. Treatments involving field burning without N application and check treatments resulted in the lowest yields. Wheat-pea rotation: for wheat, highest yields were produced under no-till management. Spring plow, fall plow, and fall chisel treatments all had lower yields. For peas, highest yields were produced in the no-till and spring plow treatments. Fall plow and fall disk treatments had lower yields. Tillage fertility: tillage fertility plots were in fallow during 2004. Continuous no-till winter wheat (USDA): yields and test weights continue to be collected on this trial with a 7-year average yield of 70.9 bu/acre.