Wheat and Grain Sorghum in Four-Year Rotations

In 1996, an effort began to quantify soil water storage, crop use, and productivity on dryland systems in western Kansas. Research 4-year rotations with wheat grain sorghum was initiated at the Southwest Research-Extension Center near Tribune, KS. Rotations were wheat-wheat-sorghum-fallow (WWSF), wheat-sorghum-sorghum-fallow (WSSF), continuous (WW). Soil planting averaged about 9 in. following sorghum, which is 3 more than average for second a WWSF rotation. only 1.5 less compared wheat. Grain yields of 2020 all long-term average. For wheat, similar after fallow but much yield recrop 75% sorghum. 60% grown rotation Generally, one or two crops; however, across years, 2 bu/a greater crops crop. Average same crops. Yield WSSF averages ~65% first