1. Dep. of Plant and Soil Sci. Texas Tech Univ. Lubbock TX 79409‐2122
2. Silver Creek Farm Lockney TX 79241
3. Dep. of Agric. and Appl. Econ. Texas Tech Univ. Lubbock TX 79409
4. Texas A&M Agric. Exp. Stn. Lubbock TX 79403
5. Texas Cooperative Extension Lubbock TX 79403
6. High Plains Underground Water Conservation District No. 1 Lubbock TX 79411‐2499
7. USDA‐ARS Lubbock TX 79415