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Titolo:
DECOMPOSITION OF WHEAT-STRAW AND RYE RESIDUES AS AFFECTED BY PARTICLE-SIZE
Autore:
ANGERS DA; RECOUS S;
Indirizzi:
AGR CANADA,CTR RECH SOLS & GRANDES CULTURES,2560 BOUL HOCHELAGA ST FOY PQ G1V 2J3 CANADA INRA,UNITE AGRON LAON PERONNE F-02007 LAON FRANCE
Titolo Testata:
Plant and soil
fascicolo: 2, volume: 189, anno: 1997,
pagine: 197 - 203
SICI:
0032-079X(1997)189:2<197:DOWARR>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOIL; MINERALIZATION; NITROGEN;
Keywords:
DECOMPOSITION; PARTICLE SIZE; RESIDUE; RYE; STRAW;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
D.A. Angers e S. Recous, "DECOMPOSITION OF WHEAT-STRAW AND RYE RESIDUES AS AFFECTED BY PARTICLE-SIZE", Plant and soil, 189(2), 1997, pp. 197-203

Abstract

Effects of contact between the soil and crop residues on the processes of residue decomposition are still poorly understood. The objective of this study was to investigate the effects of residue particle size on the decomposition of wheat (Triticum aestivum L.) straw (C/N=270) and green rye (Secale cereale) residues (C/N=9). Residue particle size was used as a means to vary the contact between crop residues and the soil. Carbon mineralization was measured during 102 d for straw and 65d for rye, on residues ranging in sizes from laboratory model (0.03 cm) to field-scale (10 cm). The soil was a silt (Typic Hapludalf) and the incubation was performed at 15 degrees C. The effects of particle size on C mineralization varied for the two residues. In the first two days of incubation, decomposition rate of rye increased with decreasing particle size but thereafter, the trend was reversed. In 65 days, 8%more C was decomposed in the 7-cm residues than in the 0.03-cm ones. For wheat straw, early decomposition (3-17 days) was faster for the small-sized particles (0.06 and 0.1 cm). Thereafter, the largest size classes (5 and 10 cm) decomposed faster. After 102 days, the very fine particles (less than or equal to 0.1 cm) showed the greatest and the intermediate size classes (0.5 and 1 cm), the lowest amount of C mineralized. We hypothesized that greater availability and accessibility of Nwas responsible for the higher rates of decomposition observed for finely-ground wheat straw while a physical protection of finely ground residues was probably involved in the observed reverse effect for rye.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:33:28