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Titolo:
Dynamics of soluble organic C and C mineralization in cultivated soils with varying N fertilization
Autore:
Chantigny, MH; Angers, DA; Prevost, D; Simard, RR; Chalifour, FP;
Indirizzi:
Agry, Agroalimentaire Canada, Ctr Rech & Dev Sols & Grandes Cultures, St Fo Agr & Agroalimentaire Canada St Foy PQ Canada G1V 2J3 des Cultures, St Fo UnivCanada, Fac Sci Agr & Alimentat, Dept Phytol, Quebec City, PQ G1K 7P4,Univ Laval Quebec City PQ Canada G1K 7P4 Phytol, Quebec City, PQ G1K 7P4,
Titolo Testata:
SOIL BIOLOGY & BIOCHEMISTRY
fascicolo: 4, volume: 31, anno: 1999,
pagine: 543 - 550
SICI:
0038-0717(199904)31:4<543:DOSOCA>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROBIAL BIOMASS-C; HORDEUM-VULGARE L; RESIDUE DECOMPOSITION; AGRICULTURAL SOIL; NITROGEN; CARBON; MATTER; MAIZE; TRANSFORMATIONS; TRANSLOCATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Chantigny, MH AgrBlvdgroalimentaire Canada, Ctr Rech & Dev Sols & Grandes Cultures, 2560 Agr & Agroalimentaire Canada 2560 Blvd Hochelaga St Foy PQ Canada G1V 2J3
Citazione:
M.H. Chantigny et al., "Dynamics of soluble organic C and C mineralization in cultivated soils with varying N fertilization", SOIL BIOL B, 31(4), 1999, pp. 543-550

Abstract

Laboratory studies have shown that N availability may affect C decomposition in soils. A field study was undertaken to determine to what extent water-soluble organic C (WSOC) and C mineralization could be affected by mineralN fertilizers. Soil cores were collected in the 1993 and 1994 growing seasons, from a sandy loam (loamy, mixed, frigid, Typic Haplorthod) and a sandyclay (fine, mixed, frigid, Typic Humaquept) under early-maturing maize (Zea mays L.). Soils were fertilized with NH4NO3 at reduced (10, 60, 120 kg N ha(-1)) or recommended (180 kg N ha(-1)) rates. For both soils, C mineralization rate increased significantly (P < 0.05) with amount of N fertilizer only at two of the nine sampling dates. However, WSOC contents generally decreased (P < 0.05) with increasing N fertilizer rate. Overall, a decrease insoil mineral N content was consistently associated with an increase in WSOC content. The relationship between soil WSOC and mineral N contents was logarithmic for both soils (r(2)=0.70 in the sandy loam and r(2)=0.89 in the sandy clay). For both soils, we estimated a critical level of N of about 60mg kg(-1), below which small decreases in mineral N were associated with large increases in WSOC contents. Crown Copyright (C) 1999 Published by Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 10:57:51