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Fig. 2. Very fine tubular macropore means as a function of soil depth in (A) Ustolls and (B) Usterts of central South Dakota (USA). Standard errors for Ustolls (N = 6) were 36, 34, 19, 25, and 44 at 0- to 0.05-, 0.05- to 0.20-, 0.20- to 0.40-, 0.40- to 0.60-, and 0.60- to 0.80-m depth, respectively. Standard errors for Usterts (N = 2) were 77, 65, 48, 50, and 29 at each depth interval respectively. *Significant (P < 0.05) difference between grass and cultivated soils. + Significant (P < 0.05) difference between no-till and till soils.
