Abstract
Aerobic
rice
production
offers
a
promising
solution
to
improve
water
use
efficiency
and
reduce
methane
(CH
4
)
emissions
by
minimizing
inundation.
However,
alternate
water‐saving
methods
for
cultivation
can
lead
“trade‐off”
of
nitrous
oxide
(N
2
O).
A
field
experiment
was
conducted
over
one
season
measuring
soil‐derived
greenhouse
gas
in
irrigated
aerobic
(
Oryza
sativa
L.)
under
different
N
fertilizer
management
at
rate
220
kg
ha
−1
,
including
nil
treatment
(“control”);
slow
release
(180
days)
polymer‐coated
urea
(“N180”);
banded
applied
upfront
(“urea”);
three
applications
broadcast
(“urea‐split”).
The
N180
reduced
soil
O
compared
with
p
<
0.001),
mean
cumulative
4.36
±
1.07
27.9
5.70
respectively.
Soil
fluxes
were
high,
reaching
up
1916
2900
µg
m
h
after
application
irrigation/rain
events,
similar
other
crops
grown
on
heavy
textured
soils.
Fertilizer
had
no
effect
CH
emissions,
which
negligible
across
all
treatments
ranging
from
1.28
2.75
C
the
growing
season.
Cumulative
carbon
dioxide
ranged
1936
3071
greatest
N180.
This
case
study
provides
first
evidence
Australia
that
enhanced
nitrogen
substantially
soils
an
system.
Our
findings
reinforce
mitigation
potential
saving
approaches
demonstrate
need
consider
control
emissions.
Frontiers in Plant Science,
Journal Year:
2025,
Volume and Issue:
16
Published: Feb. 21, 2025
Nitrous
oxide
(N2O)
emissions
from
paddy
soils,
particularly
the
rice
rhizosphere,
significantly
contribute
to
agricultural
greenhouse
gas
outputs.
This
study
explores
N2O
emission
dynamics
in
rhizosphere
(R)
and
non-rhizosphere
(NR)
soils
two
distinct
types
(JR
YC)
during
primary
growth
stages
(tillering,
jointing,
heading,
grain-filling).
Cumulative
were
measured
at
688.56,
762.90,
831.20,
1072.32
µg
N
kg-1
for
JR-NR,
JR-R,
YC-NR,
YC-R,
respectively.
Notably,
JR-R
YC-R
exhibited
increases
cumulative
by
up
20.04%
28.23%,
respectively,
compared
their
NR
counterparts
different
stages.
These
enhanced
primarily
associated
with
microbial
genera
Nitrosospira
Nitrosospirae,
influenced
factors
such
as
electrical
conductivity
(EC)
available
potassium
(AK).
The
soil
organic
carbon
total
nitrogen
ratio
(C/N)
was
a
key
determinant
influencing
abundance.
Additionally,
nitrification
inhibitors
(NIs)
demonstrated
substantial
reduction
emissions,
decrease
of
92.37%
91.93%
selected
stages,
showing
more
pronounced
effects
soils.
findings
highlight
efficacy
NIs
mitigating
Variations
efficiency
across
suggest
that
optimizing
application
timing
developing
tailored
soil-specific
strategies
could
further
enhance
effectiveness
fields.
research
provides
essential
insights
targeted
mitigation
reduce
cultivation
contributes
sustainable
practices.
Research Square (Research Square),
Journal Year:
2023,
Volume and Issue:
unknown
Published: Nov. 14, 2023
Abstract
Aims
The
mechanisms
underlying
nitrous
oxide
(N
2
O)
production
in
limed
soils
with
N
fertilizer
application
are
not
well
understood.
This
study
aimed
to
investigate
the
effects
of
liming
on
nitrite
(NO
-
)
accumulation
and
its
contribution
subsequent
O
varying
concentrations
ammonium
(NH
4
+
additions
(50,
100,
250
mg
NH
-N
kg
-1
soil).
Methods
Soil
microcosm
incubation
was
designed
NO
acidic
vegetable
soil
after
different
levels
inputs.
Sterilization
samples
used
distinguish
biotic
abiotic
productions.
DNA
extraction
relative
functional
gene
detection
provided
molecular
evidence.
Results
Elevating
pH
alkaline
(pH
8.5)
through
caused
a
shift
microbial
community,
an
increase
abundance
ammonia
oxidizing
bacteria
(AOB)
decrease
(NOB).
resulted
conversion
half
added
,
higher
leading
more
cumulative
.
However,
resulting
from
relatively
modest
(max.
0.89
μg
per
hour).
Further
experiments
demonstrated
that
81.9-93.6%
associated
driven
by
processes
under
aerobic
conditions,
while
drove
42.4-54.8%
anaerobic
conditions.
Additionally,
reduced
92%
compared
observed
soil.
Conclusion
Liming
promotes
but
reduces
emissions.
