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Fig. 5. (a) Facies X subplot group means and 95% confidence intervals for natural logtransformed NO3–Naq (g m–3), not including nondetect samples. Facies are sorted in vertical sequence followed by their average depth interval in meters given in parentheses: SL1, sandy loam (0–2.75); C, clay (2.75–3); Var1, thin, predominantly sand (2.75–3); HP1, hardpan-like paleosol (3–3.65); Var2, various sandy loam to clay loam (3.65– 6.7); S, medium sand (6.7–9); Var3, various textures (9–9.75); C-Si-L, fine-textured floodplain deposits (9–12); SL2, sandy loam (12–15); and HP2, a hardpan-like paleosol (15–15.85). Lithofacies symbols followed by the same numbers (1, 2) indicate no significant differences between lithofacies groups at the 95% significance level (C and Var3 had less than four samples and those were from only one subplot and were therefore not included in the ANOVA). Fertilizer treatments (control, standard, high) followed by the same Roman numerals (I, II) indicate no significant difference between the fertilizer treatments at the 95% significance level. (b) Facies X subplot group means of the detect–nondetect indicator variable, that is, the fraction of nondetects in each group. No means were computed for C and Var3.
