A model of animal manure nitrogen mineralisation in soil

Peter Sørensen1,Ingrid K. Thomsen1, Jaap J. Schröder2

1 Department of Agroecology, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark, www.au.dk, [email protected]

2 Plant Research International, Wageningen University and Research Centre, P.O. Box 16, 6700 AP Wageningen, The Netherlands

Abstract

A general model was developed for net mineralisation of pig and cattle slurry N in arable soil under cool moist climate conditions. The model is based on a 3-year field experiment and literature data and describes the cumulative net mineralisation of manure N during the initial 5 years after spring application. The model estimates a faster mineralisation rate for organic N in pig slurry compared to cattle slurry, and the model includes an initial N immobilisation phase for both manure types. The model estimates a cumulated mineralisation of 71% of the organic N in pig slurry and 51% of the organic N in cattle slurry after 5 years. These estimates are in accordance with other mineralisation studies and studies of manure residual N effects.