Celik et al. (2004)
also reported a higher volume of micropores due to the application
of compost for 5 years on a clay-loam soil (OM content 1.4–1.6%).
In their study, however, the volume of macropores (f > 4.5 mm)
was also observed to significantly increase. Similarly, Schjønning
et al. (1994) and Schjønning et al. (2005) reported a significantly
larger volume of micropores (f < 30 mm) in soil dressed with
animal manure (1.32% and 1.30–1.35% in OM content, respectively)
than in soil dressed with inorganic fertilizers (1.19% and 1.15–
1.25% in OM content, respectively), but the volume of macropores
(f > 30 mm) remained unaffected.