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.
KeywordsClay Porosity Corn Acetone Sludge
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