The WSU Wilke Research and Extension Farm is a 320-acre facility located on the eastern edge of Davenport, WA, and is split (north and south) by State Highway 2. Washington State University maintains and operates the facility. The focus of this annual technical bulletin is on farmers in the intermediate cropping zone (12 to 17 inches of annual precipitation) and the field-men who assist them. It is also designed for documenting operations and production on the Wilke Farm for University faculty to assist with small plot research experiments.
The Wilke Farm remains in a direct seed cropping system utilizing no-till fallow, winter wheat, and spring cereals. Broadleaf crops remain a viable option and are substituted with spring and winter cereals when weed pressures and market prices create opportunities for profitable production. The predominant cropping system practiced by farmers in this region is a 3-year rotation, which includes summer fallow, winter wheat, and spring cereals. Farmers are interested in intensifying rotations to reduce fallow years and increase crop diversity to improve long-term agronomic benefits and economic stability.
The south side of the farm is divided into seven plots; three plots are in a more traditional 3-year crop rotation, and four plots are in an intensified 4-year crop rotation. The north side of the farm remains in an intensified rotation that forgoes summer fallow, and is in a continuous cereal grain production. In 2010 through 2013, cereal rye (feral rye) infestations caused cropping decisions to be altered on the Wilke Farm, especially in the no-till fallow winter wheat portion of the rotations (these changes are noted in red italic in the data tables). In the fall of 2013, the no-till fallow winter wheat portion of the rotation was seeded as planned according to the rotation without alterations due to feral rye.
Soil compaction and wireworm population data are collected each spring from GPS recorded locations within each plot. Soil samples are also collected from these GPS locations prior to seeding each plot, and fertilizer is applied according to soil samples results and WSU recommendations.
Winter wheat was seeded by Crop Production Service’s Case IH direct-seed hoe drill with Anderson openers on 12-inch spacing. The spring crops were seeded with Kevin Klein’s SeedMaster direct-seed hoe drill on 12-inch spacing (Figure 1). The farm was harvested with our John Deere 6622 combine on August 11 through 25, 2014 (Figure 2).
Plot 4 and Plot 5 were seeded to ‘Crescent’ soft white winter club wheat on September 10, 2013, at 70 lb/ac into no-till fallow. Seed was treated with 0.33oz/cwt CruiserMaxx Cereals plus Vibrance. Anhydrous ammonium was applied below the seed at 90 lb N/ac. Liquid ammonium Thio-Sul, 12-0-0-26, ammonium polyphosphate, 10-34-0-0, and Power Up, 6-18-6-1 were applied at a rate of 6-9-1-7 with the seed. Post-emergence herbicide/fungicide application was applied on April 30, 2013. This application included 3.5 oz/ac PowerFlex, 24.6 oz/ac Bison Advance, 4.0 oz/ac Bumper 41.8 EC, 10.0 oz/ac Topsin, and 1.0 lb/ac spray grade fertilizer.
Spring Wheat (3-year Plot 7; 4-year Plot 3; Continuous North)
Plot 3 was seeded to ‘Diva’ soft white spring wheat into canola residue on April 29, at 75 lb/ac. It was treated with 0.33 oz/cwt CruiserMaxx Cereals plus 1.0/cwt Nipsit Inside. Anhydrous ammonium was applied below the seed at 43 lb N/ac, and liquid ammonium thiosulfate, 11-37 and NACHURS was applied at a rate of 7-12-1-9 with the seed. Liquid boron was also applied with the seed at 10.5 oz/ac. Prior to seeding on April 25, 32.0 oz/ac RT3 (glyphosate), 1.5 qt/100 gal Alliance, and 1.0 qt/100 gal Activate were applied. Post-emergence weed control was applied on June 5. This application included 16.4 oz/ac Axial XL and 17.0 oz/ac Orion.
On April 29, Plot 7 was seeded to ‘Dayn’ hard white spring wheat into winter wheat residue at 75 lb/ac.