Ammonification in soil aggregates: Effect of some physical, physico-chemical and chemical properties

Aggregate diameter affected significantly the intensity of ammonification in chernozemic rendzina but not in lessive soil. In the latter the process was influenced significantly by the number of microorganisms able to grow on asparagine agar. A high correlation, though not significant at the level of 0.05, was found between the ammonification intensity and the content of pores of radius: 3-15, 75-5.0, 05-0.25 and 0.01-0.005 mu m in chernozemic rendzina and those measuring 1.5-05, 0.025-0.01, 0.01-0.005 and >75 mu m in lessive soil aggregates as well as the percentage of soil particles of 100-50 mu m in chernozemic rendzina aggregates and the internal surface area and organic C in aggregates of lessive soil.