Fig. 4. Total soil porosity using assumed (2.65 Mg m^–3) and measured particle density for moldboard plow (MP), no-till with no beef cattle manure (NT), no-till with beef cattle manure (NTm), pasture, and forest long-term management practices at three depth intervals. Different letters within the same treatment indicate significant differences between the two porosities at the 0.05 probability level.