This cover crop mixture plot is a combination of all 42 entries planted in the Noble Research Institute cover crop demonstration plots for the summer of 2017. It includes entries of oats, sorghum, sorghum sudan, sudan, pearl millet, foxtail millet, browntop millet, soybeans, cowpeas, mungbeans, guar, sunn hemp, flax, buckwheat, okra, chicory, sunflower, radishes, turnips, mustards and other brassicas. It provided a diversity of plant heights and leaf structure, which in turn provided good ground cover and weed suppression. Seeding rate was 33 pounds per acre, which was the average of the seeding rate for all the entries included.
The plots were drill planted in 7.5 inch rows in a clean-tilled and culti-packed seedbed on May 16, 2017 at the Noble Research Institute Headquarters Farm in Ardmore, Oklahoma on a Weatherford fine sandy loam. Planting depth was shallow, about 0.5 inch, in a dry seedbed and 2.33 inches of rain fell over the next three days. There was no fertilizer, insecticide, or herbicide applied to the crops and pigweed pressure in the field was very heavy. Rainfall was below average after establishment.