We used mercury-intrusion porosimetry in a study on modification of total porosity and pore-size distribution (PSD) at different depths (5, 10, 15, and 20 cm) in a rice soil puddled by three different mechanical implements. All treatments caused a layer of reduced porosity to form at the soil surface. At rice harvest time the porosity along the profile was similar to that found in the soil before puddling. Pore-size distributions were similar for the different treatments. Pores larger than 50 μm equivalent cylindrical diameter (ECD) decreased by about 50% at the 5-cm depth immediately after puddling.
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