Methane emissions from Louisiana rice fields amended with nitrogen fertilizers

Methane emissions and dissolved CH 4 concentrations were measured from a flooded Louisiana rice field. Treatment plots contained the early long-grain cultivar Lacassine, drill-seeded into a Crowley silt loam (Typic Albaqualfs). Before flooding urea, ammonium sulfate and potassium nitrate were applie...

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Bibliographic Details
Published in:Soil biology & biochemistry 1994, Vol.26 (3), p.353-359
Main Author: Lindau, C.W.
Format: Article
Language:English
Subjects:
ammonium sulfate
Animal, plant and microbial ecology
application rate
Applied ecology
Biological and medical sciences
concentration
Ecotoxicology, biological effects of pollution
emissions
flooding
Fresh water environment
Freshwater
Fundamental and applied biological sciences. Psychology
losses from soil
methane
methane production
nitrogen fertilizers
nutrient sources
potassium nitrate
rice soils
seasonal variation
soil water
urea
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Summary:Methane emissions and dissolved CH 4 concentrations were measured from a flooded Louisiana rice field. Treatment plots contained the early long-grain cultivar Lacassine, drill-seeded into a Crowley silt loam (Typic Albaqualfs). Before flooding urea, ammonium sulfate and potassium nitrate were applied at 0,60 or 120 kg N ha −1 and CH 4 fluxes were measured twice a week until harvest. Dissolved CH 4 concentrations in vertical floodwater-soil profiles (with or without plants) were measured during the early, middle and late growing season. Methane evolution during the 93 day sampling was ca 60, 70, 80 and 110kg ha −1 from the control and low N rate of ammonium sulfate, potassium nitrate and urea, respectively. Methane emissions from plots treated with 120 kg N ha −1 totaled 90, 100, and 220 kg ha −1 for potassium nitrate, ammonium sulfate and urea treatments, respectively. The high ammonium sulphate and potassium nitrate rate reduced CH 4 emissions by 55 and 59%, respectively, compared to fluxes measured from the high urea rate. No positive correlations were observed between seasonal soil temperatures (0, 5 and 10 cm depths) and fluxes. Dissolved concentrations increased during the growing season and concentrations as high as 245 μM were measured in unplanted plots ca 3 weeks before harvest.
ISSN:0038-0717
1879-3428
DOI:10.1016/0038-0717(94)90284-4