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Titolo:
LOSS OF NITROGEN IN COMPACTED GRASSLAND SOIL BY SIMULTANEOUS NITRIFICATION AND DENITRIFICATION
Autore:
ABBASI MK; ADAMS WA;
Indirizzi:
UNIV WALES,INST BIOL SCI,SOIL SCI UNIT ABERYSTWYTH SY23 3DE DYFED WALES
Titolo Testata:
Plant and soil
fascicolo: 2, volume: 200, anno: 1998,
pagine: 265 - 277
SICI:
0032-079X(1998)200:2<265:LONICG>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
NET MINERALIZATION; IRRIGATED COTTON; INHIBITORS; AMMONIUM; OXIDE; INCUBATION; INCREASE; RECOVERY; PASTURE; GROWTH;
Keywords:
COMPACTED SOIL; DENITRIFICATION; GRASSLAND; MINERALIZATION; NITRIFICATION; NITROUS OXIDE; SIMULTANEOUS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
M.K. Abbasi e W.A. Adams, "LOSS OF NITROGEN IN COMPACTED GRASSLAND SOIL BY SIMULTANEOUS NITRIFICATION AND DENITRIFICATION", Plant and soil, 200(2), 1998, pp. 265-277

Abstract

The soils of mid-Wales in grazed permanent pasture usually exhibit stagnogley features in the top 4-10 cm even though on sloping sites, they are freely drained. Nitrogen is often poorly recovered under these conditions. Our previous studies suggest that continuing loss of available N through concurrent nitrification and denitrification might provide an explanation for poor response to fertilizer N. The work described was designated to further test this proposition. When NH4+-N was applied to the surface of intact cores, equilibrated at -5kPa matric potential, about 70% of NH4+-N initially present was lost within 56 days of incubation. Study of different sections of the cores showed a rise in NO3- level in the surface 0-2.5 cm soil layer but no significant changes below this depth. The imbalance between NO3- accumulation and NH4 disappearance during the study indicated a simultaneous nitrification and denitrification in the system. Furthermore. the denitrification potential of the soil was 3-4 times greater than nitrification potential so no major build-up of NO3- would be expected when two processes occur simultaneously in micro-scale. When nitrification was inhibited by nitrapyrin, a substantial amount of NH4+-N remained in the soil and persisted till the end of the incubation. The apparent recovery of applied N increased and of the total amount of N applied, 50% more was recovered relative to without nitrapyrin. It appears that addition of nitrapyrin inhibited nitrification, and consequently denitrification, bylimiting the supply of NO3- for denitrifying organisms. Emission of N2O from the NH4+ amended soil cores further confirmed that loss of applied N was the result of both nitrification and denitrification, whichoccurred simultaneously in adjacent sites at shallow depths. This N loss could account for the poor response to fertilizer N often observedin pastoral agriculture in western areas of the UK.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 15:38:17