Fig. 1. Winter wheat yield as affected by available soil water content at planting (in 0–180 cm depth) at Akron, CO. (a) All data (1993–2001) by crop rotation; (b) data from dry years (April–June Pan evaporation - Precipitation >65 cm); (c) data from average and wet years (April–June Pan evaporation - Precipitation <65 cm).