par Cheneby, D.;Nicolardot, B.;Godden, Bernard 
;Penninckx, Michel
Référence Biological agriculture & horticulture, 10, page (255-264)
Publication Publié, 1994
;Penninckx, Michel Référence Biological agriculture & horticulture, 10, page (255-264)
Publication Publié, 1994
Article révisé par les pairs
| Résumé : | Fresh farmyard manure (C-to-N ratio = 20.3) was composted in the presence of 15N-labelled (NH4)2SO4using a bench-scale reactor under temperature conditions which reproduce the evolution of compost in a pile. C and N mineralization of composted farmyard manure (C-to-N ratio = 12.5) was monitored in two silty soils during an aerobic incubation at 28°C and 100% of WHC for 76 weeks. C mineralization of compost was assumed to come from a labile and a recalcitrant fraction which decomposed according to 1 and 0 order kinetic reactions, respectively [Cm = Ciabile.(l-e-kiabile.t) + kresistam.t]. The size of the labile fraction (Clabile) represented 31.3 and 19.9% of compost-C for the two soils, and its mineralization rate constant (kiabile) ranged from 0.03 to 0.09 day"1. N-mineralization was assumed to come from only one labile fraction [Nm = Niabile.(l-e-kiabile.t)]. This fraction ranged from 34 to 25% of compost-N for the two soils; its mineralization rate constant did not vary with soils (0.006 day-1). Composted farmyard manure produced under these laboratory conditions may not have been completely mature when added to soil and totally representative of comparable material composted in a pile. Nevertheless, it was considered as fairly mineralizable and its mineralization was greatly influenced by soil type. © 1994 A B Academic Publishers. |
