Plants,
Год журнала:
2024,
Номер
13(24), С. 3475 - 3475
Опубликована: Дек. 11, 2024
Straw
return
plays
a
vital
role
in
crop
yield
and
sustainable
agriculture.
Extensive
research
has
focused
on
the
potential
to
enhance
soil
fertility
through
straw
return.
However,
impacts
of
saline–sodic
soils
have
been
relatively
neglected
due
unfavorable
characteristics
soils,
such
as
high
salinity,
poor
structure,
low
nutrient
contents,
which
are
not
conducive
growth.
Therefore,
two-year
field
experiment
was
conducted
assess
effects
management
(retention
or
removal)
with
nitrogen
fertilizers
(0,
90,
180,
270,
360
kg
N
ha−1)
aggregates,
chemical
properties,
rice
yields
soil.
The
results
showed
that
fertilization
significantly
decreased
exchange
sodium
percentage
(ESP)
organic
carbon
contribution
silty
clay
particles
also
increased
aggregate
stability,
matter
(SOM),
macroaggregates.
there
no
significant
difference
between
270
ha−1
for
all
indicators
under
grain
by
5.77%
(two-year
average)
compared
removal.
highest
8.01
t
obtained
from
combined
ha−1.
since
this
only
two
years,
positive
long-term
could
greater.
application
early
stages
is
promising
practice
improving
increasing
yields.
Agronomy,
Год журнала:
2025,
Номер
15(3), С. 651 - 651
Опубликована: Март 5, 2025
The
delayed
decomposition
of
rice
straw
in
Northeast
China’s
cold
regions
(winter
temperatures
<
−20
°C)
due
to
insufficient
accumulated
temperature
requires
innovative
solutions.
This
study
developed
a
synergistic
approach
combining
microbial
with
mechanical
burial.
Pre-experiments
identified
optimal
parameters
for
the
liquid
decomposing
agent
(100
mg/mL
concentration,
6
g/m
application
rate).
A
novel
combined
machine
was
engineered
adjustable
parameters:
knife
roller
speed
(200–300
r/min),
burial
depth
(15–25
cm),
and
ground
clearance
(80–120
mm).
Field
trials
demonstrated
91.3%
return
rate
under
optimized
settings
(220
r/min,
100
mm
clearance,
1.7
m/s
speed),
representing
28.5%
improvement
over
conventional
methods.
Spring
enhanced
83.6%
within
60
days
(vs.
67.2%
autumn),
significantly
increasing
soil
organic
matter
available
nitrogen.
integrated
technology
achieved
1.5
hm2/h
operational
efficiency,
meeting
regional
agronomic
demands.
provides
replicable
model
cold-region
utilization,
aligning
carbon
sequestration
goals
black
conservation.
Agriculture,
Год журнала:
2025,
Номер
15(6), С. 650 - 650
Опубликована: Март 19, 2025
Lime
application
is
an
effective
measure
for
improving
rice
yield
and
alleviating
soil
acidity,
whereas
its
long-term
effects
on
the
sequestration
stability
of
organic
carbon
(SOC)
remain
unclear
in
paddy
fields.
Here,
we
report
first
10-year
experiment
to
examine
impact
lime
quantity
quality
SOC
acidic
field
with
double
cropping.
was
applied
every
4
years
without
straw
incorporation.
Size
density
fractionation
solid-state
13C
nuclear
magnetic
resonance
spectroscopy
were
employed
physical
fractions
chemical
composition
SOC,
respectively.
The
results
showed
that
had
no
significant
effect
either
total
concentration
or
stocks.
Compared
non-lime
control,
led
a
60.0%
decrease
free
particulate
(fPOC)
but
17.9%
increase
occluded
(oPOC)
while
reducing
mineral-associated
(MAOC)
by
5.3%.
Chemical
analyses
revealed
5.1%
reduction
content
alkyl
(C)
6.8%
ratio
Alkyl
C
O-Alkyl
C.
retention
interactive
SOC.
Under
removal,
increased
oPOC
56.6%,
observed
under
return.
MAOC
it
reduced
this
9.8%
proportion
9.5%,
Therefore,
conclude
although
stocks
are
not
altered,
reduces
soil,
suggesting
liming
may
reduce
stability.
Soil Science Society of America Journal,
Год журнала:
2025,
Номер
89(2)
Опубликована: Март 1, 2025
Abstract
Soil
organic
carbon
(SOC)
pool
of
cropland
is
one
the
most
active
parts
global
C
pool.
Hence,
it
important
to
estimate
SOC
stock,
drivers,
and
future
evolutionary
trends
in
order
improve
sequestration
emission
reduction
capacity
soil
stability
food
production.
In
this
study,
we
utilized
856
samples
for
density
(SOCD)
at
a
depth
0–20
cm
544
SCOD
0–100
cm.
Using
five
machine
learning
models
combined
with
environmental
factors
data,
predicted
spatial
distribution,
key
China's
croplands.
The
results
were
as
follows:
(1)
mean
values
SOCD
2.98
7.88
kg
m
−2
,
respectively,
stocks
5.64
14.91
Pg,
which
accounted
15.78%
17.25%
terrestrial
ecosystems,
respectively.
(2)
physicochemical
properties
consistently
explained
more
variation
uniquely
than
other
factors,
explaining
50%
43%
was
mainly
driven
by
nitrogen
deposition
human
impacts;
pH,
normalized
difference
vegetation
index,
annual
precipitation,
temperature.
(3)
Under
Shared
Socioeconomic
Pathway
5–8.5
(high‐C
emissions),
greatest
decline
trend
two‐depth
stock.
Our
study
understanding
changes
enhancing
implement
mitigation
adaptation
strategies.
Land Degradation and Development,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 25, 2025
ABSTRACT
Straw‐returning‐driven
sequestration
of
soil
organic
carbon
(SOC)
is
critical
for
cropland
(C)
storage
and
stability.
However,
the
effects
plant‐
microbe‐derived
C
accumulation
in
SOC
remain
unclear
rice
systems.
Herein,
this
study
synthetically
explored
response
microbial
necromass
lignin
phenols
to
straw
return
assessed
their
contributions
under
two
application
amounts
durations.
The
field‐based
experiment
was
established
1982.
results
indicated
that
returning
paddy
fields
significantly
increased
content
by
7%–46%,
with
a
higher
rate
longer
duration
yielding
greater
increases.
Fungal
(FNC)
showed
(3.8–5.9
g
kg
−1
)
proportion
(20%–25%)
than
bacterial
(BNC;
1.6–2.5
9%–11%).
amount
returns
had
small
influence
on
proportions
FNC
BNC
SOC.
Accumulation
(0.2–0.8
soils
(1%–3%)
were
lower
those
amino
sugars
(0.7–1.1
3.8%–4.5%)
not
affected
or
duration.
Soil
closely
associated
available
nitrogen
(AN),
biomass
(MBC),
(MBN)
contents,
whereas
strong
link
AN
MBC
contents.
phenol
related
AN,
potassium,
accumulations
positively
contributed
SOC,
MBC,
MBN
contents
indirectly
regulating
C.
These
highlight
benefits
sequestration,
linked
positive
accumulation.
