During the past decade many simulation models have been developed to describe the cycling of nutrients especially N in soil have classified soil N models according to their purpose dynamics and concept.Scientific models which have been developed to better understand the mechanisms of coupling of N transformations processes may be divided into
Have we briefly discuss pertinent aspects of the kinetics of turnover of soil biomass to provide background information on the concepts expressed in the recently modified models this model has been further modified on the basis of laboratory and field data obtained with different Australian soil