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Fig. 2. Monthly precipitation and temporal variation of bulk density for sampling depths 0 to 3, 3 to 6, and 6 to 9 cm. Symbols represent the mean and the bars are one standard error (n = 5). Precipitation data courtesy of Pullman NOAA Weather Station, WA (Jeff Smith, USDA-ARS, Pullman, WA, personal communication, 2003).