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a Dep. of Soil, Water, and Environmental Sci., Univ. of Arizona, 429 Shantz Building, Room 38, Tucson, AZ 85721 USA b Pioneer Hi-Bred International, Inc., P.O. Box 1150, Johnston, IA 50131 USA c Western Farm Service, 24730 Ave. 13, Madera, CA 93637 USA
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