Nitrous oxide production in soils cropped to corn with varying N fertilization

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 . Denitrific...

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Bibliographic Details
Published in:Canadian journal of soil science 1998-11, Vol.78 (4), p.589-596
Main Authors: Chantigny, M.H, Prevost, D, Angers, D.A, Simard, R.R, Chalifour, F.P
Format: Article
Language:English
Subjects:
ammonium nitrate
application rate
carbon
clay soils
denitrification
nitrogen
nitrous oxide
nutrient availability
sandy loam soils
sandy soils
seasonal variation
soil air
soil bacteria
soil pore system
solubility
Zea mays
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Summary: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 N 1 O production rates, air-filled porosity (AFP), water-soluble mineral N (WSMN) and water-soluble organic C (WSOC) were measured. Denitrification and N 2 O production rates were generally small, but values >2 µg N 2 O-N kg −1 h −1 were measured (i) when WSMN contents exceeded 5 mg kg −1 , and (ii) when AFP was
ISSN:0008-4271
1918-1841
DOI:10.4141/S98-009