Porosity and Pore Size Distribution in a Field Test Following Sludge and Compost Application
Soil porosity and pore size distribution have been studied in a field test. Aerobic and anaerobic sludges and their composted mixtures with the organic fraction of urban refuse were used and compared with manure. Addition rates were equivalent to 50 and 150 tons/ha of manure on the organic carbon basis. A control plot, was also present.
The residual effect on soil porosity and pore size distribution was also analyzed the year following that of treatments. Measurements were carried out on large thin sections of soil samples by means of electro-optical image analysis. All organic materials increased significantly the total porosity which remained significantly higher than the control the following year.
Pores ranging from 50 to 500 µm, which are considered the most important both in soil-water-plants relationships and in mantaining a good soil structure, also increased after all organic treatments. Therefore sludges and composts improved porosity and pore size distribution in a similar way to the manure.
KeywordsThin Section Pore Size Distribution Sewage Sludge Total Porosity Anaerobic Sludge
Unable to display preview. Download preview PDF.
- 1).Kladivko, E.J. and Nelson, D.W., 1979 — Changes in soil properties from application of anaerobic sludge. Journal W.P.-C.F., 51, 325–332.Google Scholar
- 5).Ismail, S.N.A., 1975 — Micromorphometric soil porosity characterization by means of electro-optical image analysis (Quantimet 720). Soil Survey Papers N° 9, Netherlands Soil Survey Institute, Wageningen, 104 pp.Google Scholar
- 7).Pagliai, M., Guidi, G. and La Marca, M., 1980 — Macro and micromorphometric investigation on soil-dextran interactions. J. Soil Sci. (in press).Google Scholar
- 8).Jongerius, A. and Heintzberger, G., 1975 — Methods in soil micromorphology. A technique for the preparation of large thin sections. Soil Survey paper N° 10, Netherland Soil Survey Institute, Wageningen 48 pp.Google Scholar
- 10).Pagliai, M. and Guidi, G., 1979 — Micromorphological determinations of soil porosity in field experiments with sewage sludge and compost. European Symp. on Characterization and Utilisation of Sewage Sludges. Cadarache, 13–15 February, 1979 (in press).Google Scholar