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Fig. 3. Average P concentration in soil water at (A) 91 cm and (B) 152 cm below the surface in a dairy effluent sprayfield for 3-mo periods from April 1998 to March 2001. An arrow following a letter indicates consecutive means with the same letter. Means with the same letter are not different (P > 0.05). Standard deviations for means (in consecutive order over the 3-yr period) were (A) 0.9, 0.5, 0.6, 0.4, 0.3, 0.3, 0.3, 0.2, 1.2, 1.9, 0.3, and 0.2; and (B) 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, < 0.1, 0.3, 2.3, 0.2, and 0.2.
