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Biochemical Quality of Crop Residues and Carbon and Nitrogen Mineralization Kinetics under Nonlimiting Nitrogen Conditions

^a INRA - Unité d'agronomie de Châlons-Reims, Centre de Recherche Agronomique, 2 esplanade Roland Garros, BP 224, 51686 Reims cedex 2, France
^b INRA - Unité d'agronomie de Laon-Péronne, rue Fernand Christ, 02007 Laon cedex, France
^c INRA - Station d'agronomie, 71 avenue Edouard Bourlaux, BP 81, 33883 Villenave d'Ornon cedex, France
^d INRA - CMSE Laboratoire de Microbiologie des Sols, 17 rue Sully, BP 1540, 21034 Dijon cedex, France

View larger version (21K): [in a new window]   Fig. 1 Main characteristics of the 47 studied residues (A) compared with published data: Collins et al., 1990 (B); Constantidines and Fownes, 1994 (C); Cotrufo et al., 1994 (D); Fox et al., 1990 (E); Frankenberger and Abdelmagid, 1985 (F); Herman et al., 1977 (G); Iritani and Arnold, 1960 (H); Kachaka et al., 1993 (I); Mafongoya et al., 1998 (J); Müller et al., 1988 (K); Oglesby and Fownes, 1992 (L); Palm and Sanchez, 1991 (M); Quemada and Cabrera, 1995 (N); Reinertsen et al., 1984 (O); Seneviratne et al., 1998 (P); Taylor et al., 1989 (Q)

View larger version (45K): [in a new window]   Fig. 2 Carbon mineralization of the 47 residues measured during soil incubation (coefficients of variation are less than 0.05). 32 is oilseed rape wall pods; 46 is wheat straw; 41 is mixed stems and roots of peas; 34 is oilseed rape leaves

View larger version (23K): [in a new window]   Fig. 3 Relationships between C mineralization of residues during a 7-d incubation period and the water soluble-C content of residues (dotted lines indicate the confidence interval at 95% level)

View larger version (42K): [in a new window]   Fig. 4 Dynamics (immobilization or mineralization) of soil inorganic N due to addition of crop residues (coefficients of variation are less than 0.05). 37 is alfalfa shoots; 21, 27, and 10 are oilseed rape leaves; 47 is maize straw

View larger version (19K): [in a new window]   Fig. 5 Relationships between the net effect on soil inorganic N after a 168-d incubation period due to addition of crop residues and the organic N content of residues (dotted lines indicate the confidence interval at 95% level)