Photograph of various cropping systems at the Cherokee Experiment Station. The back of the photograph proclaims, "Cropping systems. (A). Caddo Switchgrass 3 year, rotated with 3 years wheat, the wheat yield average 39.9 bu. per acre. (B) Compared to 3 years alfalfa rotated with 3 year wheat, the wheat yields averaged 46.6 bu. per acre. (C) Continuous wheat No. N/A equals 33.5 by per ac. (D). Continuous wheat 40 lb. N/A equals 46.6 bu. per acre. Three years Caddo Switch is only beginning to have its effect on soil improvement."

Photograph of the Cherokee Experiment Station, Cherokee, OK. HQ shown in the background. More than 300 farmers and agricultural workers at the Field day, May 24 (1962). Two treatments are applied to wheat as shown in the foreground. Average yields of wheat "cleaned" tilled continuous wheat without nitrogen is 41.2 bushels per acre. Stubble mulched continuous wheat with 40 pounds. Nitrogen is 45.4 bushels per acre. OK-1724-1.