Fig. 1. Weed biomass (dry weight) of green foxtail and field sandbur in proso millet in five rotations, 8 yr after initiation of study at Akron, CO. Data are averaged across 2 yr. Bars with the same letter are not significantly different based on Fisher's LSD (0.05). Crop codes: W = winter wheat, M = millet, F = fallow, and C = corn.