OD wt is the oven dry weight. Varies from horizon to horizon depending on aggregation, texture, and organic matter. A temporary road is placed at your sampling location. Six months later you take another sample of the same dimensions and find that it now has a oven-dry weight of 520 g. Therefore, as r b increases, pore space decreases.
Total porosity is greater in fine textured soils and lower in coarse-textured soils.
The percentage of microspore space increases in fine-textured soils while the percentage of macropore space is small. 10.0 Structural Management of Soils 1. 2 Avoid tillage and traffic when the soil is too wet. Keep soil surface covered with residue 4. Incorporation of residues is also helpful.