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a Texas A&M Univ. Texas Agricultural Experiment Station, RR 3, Box 219, Lubbock, TX 79403
b Soil-Plant Nutrient Res. Unit, USDA-ARS, P.O. Box E, Fort Collins, CO 80522
c Dep. Agric. & Applied Econ., Texas Tech Univ., Lubbock, TX 79409
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