||Porosity and Pore-Size Distribution of Soil Aggregates.
Li, Shen-maw ;
||Minnesota Univ., Minneapolis. Water Resources Research Center.
||WRRC-Bull-29; OWRR-A-002-MINN; 08663,; A-006-Minn(3)
( Soil aggregates ;
( Soil water ;
Water storage) ;
Particle size ;
Soil structure ;
Plant growth ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Differences in aggregate porosity due to soil type, aggregate size and cultivation condition were investigated using samples from 6 Minnesota soils. Porosity characteristics were determined by the glassbead displacement and thin section methods and with Hg-porosimeter measurements. Aggregate porosity was higher in soils developed on loess and lower in those on till. Porosities ranged from 0.253 to 0.497. Aggregate porosity of virgin soil was higher than that of cultivated soil. Specific pore volume of pores of diameters 0.012 to 17 microns ranged from 0.124 to 0.272 cc/g. Over 90% of the specific pore volume was contributed by pores of diameter greater than 0.2 microns. The proportion of intraaggregate porosity to the total porosity was found to be about 0.30 for cultivated soils and 0.30 to 0.40 for virgin soils. (WRSIC Abstract)