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Titolo:
Nitrous oxide production in soils cropped to corn with varying N fertilization
Autore:
Chantigny, MH; Prevost, D; Angers, DA; 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 UnivaLaval, Fac Sci Agr & Alimentat, Dept Phytol, St Foy, PQ G1K 7P4, Canad Univ Laval St Foy PQ Canada G1K 7P4 ept Phytol, St Foy, PQ G1K 7P4, Canad
Titolo Testata:
CANADIAN JOURNAL OF SOIL SCIENCE
fascicolo: 4, volume: 78, anno: 1998,
pagine: 589 - 596
SICI:
0008-4271(199811)78:4<589:NOPISC>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
DENITRIFICATION; NITRATE; CARBON; WATER; INHIBITION; GRASSLAND; ACETYLENE; AMMONIUM; OXYGEN; YIELD;
Keywords:
denitrification; nitrous oxide; N fertilizers; available N; grain corn;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Chantigny, MH AgrBoulgroalimentaire Canada, Ctr Rech & Dev Sols & Grandes Cultures, 2560 Agr & Agroalimentaire Canada 2560 Boul Hochelaga St Foy PQ Canada G1V 2J3
Citazione:
M.H. Chantigny et al., "Nitrous oxide production in soils cropped to corn with varying N fertilization", CAN J SOIL, 78(4), 1998, pp. 589-596

Abstract

Mineral N fertilizers may contribute to N gas emissions to the atmosphere. Soil cores were collected in 1993 and 1994, in a sandy loam and a sandy clay cropped with an early-maturing corn (Zea mays L.) hybrid and fertilized with ammonium nitrate at rates of 10, 60, 120 or 180 kg N ha(-1). Denitrification and N2O production rates, air-filled porosity (AFP), water-soluble mineral N (WSMN) and water-soluble organic C (WSOC) were measured Denitrification and N2O production rates were generally small, but values >2 mu g N2O-N kg(-1) h(-1) were measured (i) when WSMN contents exceeded 5 mg kg(-1) and(ii) when AFP was <50 to 55% in the sandy loam, and <40 to 45% in the sandy clay. For most sampling dates, N2O production and denitrification rates increased with N fertilizer level. In 1993, AFP was relatively high and variable in soil cores, and regression analyses revealed that denitrification rates were closely related to AFP. In 1994, AFP was relatively low in soil cores, and regression analyses showed that denitrification and N2O production rates were positively related to WSMN and negatively to WSOC. It is suggested that provided AFP was low, N fertilization may have had either a direct effect on denitrification and N2O production rates by determining WSMN availability to microorganisms, or an indirect effect by affecting WSOC metabolism in soil. Depending on the year and soil type, mean denitrification rates were 40 to 130% greater in the soil with 180 than with 120 kg N ha(-1). Corresponding N2O production rates were 50 to 200% higher in the 180 thanin the 120 kg N ha(-1) treatment. It appears that limiting N fertilizer to120 kg ha(-1), under early-maturing corn production, may prevent excessivegaseous N losses due to denitrification.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 16:45:59