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Feasibility of Four-Year Crop Rotations in the Central High Plains

^a Southwest Res.-Ext. Cent., Kansas State Univ., Tribune, KS 67879
^b Southwest Area Ext., Kansas State Univ., Garden City, KS 67846

View larger version (22K): [in a new window]   Fig. 1. Distribution of available soil water (ASW) within the soil profile at winter wheat planting, 1997–2000, Tribune, KS. Capital letter denotes specific crop in the cropping system. WSSF, wheat–sorghum–sorghum–fallow; WWSF, wheat–wheat–sorghum–fallow; WW, continuous wheat.

View larger version (21K): [in a new window]   Fig. 2. Distribution of available soil water (ASW) within the soil profile at grain sorghum planting, 1996–1999, Tribune, KS. Capital letter denotes the specific crop in the cropping system. WSSF, wheat–sorghum–sorghum–fallow; WWSF, wheat–wheat–sorghum–fallow.

View larger version (33K): [in a new window]   Fig. 3. Net returns for various crop rotations with differing lengths of fallow, Tribune, KS. WWSF, wheat–wheat–sorghum–fallow; WSSF, wheat–sorghum–sorghum–fallow; WSF, wheat–sorghum–fallow; WW, continuous wheat.

View larger version (23K): [in a new window]   Fig. 4. Required recrop wheat yields in a wheat–wheat–sorghum–fallow (WWSF) rotation, at several wheat prices, such that returns equal those of wheat–sorghum–fallow (WSF), based on analyses at Tribune, KS.

View larger version (23K): [in a new window]   Fig. 5. Required recrop grain sorghum yields in a wheat–wheat–sorghum–fallow (WSSF) rotation, at several sorghum prices, such that returns equal those of wheat–sorghum–fallow (WSF), based on analyses at Tribune, KS.