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Deb Sanjit KUMARAcetylene (C,H,) inhibition technique was used tomeasure denitriﬁcation N loss from lowland rice ﬁeld  !"#$ῌ%&in Thailand on the observation that in the presenceof C,H, concentrations ranging from *.- to +.,῍ (vol/(b)cdefvol) gaseous N loss appeared exclusively as N,O.

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Total denitriﬁcation N loss, emitted as N,O®N, form(b).jkl65 im/ 0_mnJopat the C,H, treated site, was calculated to be +.231

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5<567M@C(Nand *.,/+ kg-N/ha for the ponding period (23 days).

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In contrast, N loss in the form of N,O at the control@{)J7  X 96:; <|C<}LJ%site was +.0*3 kg-N/ha and *.,, for these periods, : =>op 1s t 5 8s 1s ~respectively.

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High proportion of N,O in the ratio ofN,O to N,O®N, might be attributed to the acidityof the soil and the relatively lower soil tempera-'()*+, -./0

ture because of ponding water.

The observation

revealed that whether ponding water is present or?cdef  @absent was a major controlling factor for N,O ﬂux as

ABCDE: AB <|TZCDE[#_-ponding water on the soil surface greatly suppressed\7P :  C@&'56;6the emissions of highly soluble N,O, while very highF;CDE[#@-Y;7 G65 ABHpeaks of N,O were observed during absence of pond-@  N% !"- +** cc ?/

ing water.

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ABCDE : H65

N,O emissions were highly a#ected by

NO--N concentration in the reduced *ῌ,* cm plow

JK_F7layer as well as soil temperature, yielding higher N,O_8% &'@5- AB LMC emission with higher NO--N concentration and soil

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