1. Texas A&M AgriLife Research; 1102 East FM 1294 Lubbock TX 79403
2. Dep. of Plant and Soil Science; Texas Tech Univ.; Lubbock TX 79409
3. Texas A&M AgriLife Research; College Station TX 77843
4. Agricultural Sciences Center; New Mexico State Univ.; Clovis NM 88001
5. Texas A&M AgriLife Research; Stephenville TX 76401