SSRN Electronic Journal,
Journal Year:
2022,
Volume and Issue:
unknown
Published: Jan. 1, 2022
Rice
(
Oryza
sativa
L.)
cultivation
by
continuous
flood
irrigation
is
widely
adopted
growers
worldwide.
Maintaining
optimum
depth
during
the
growing
season
can
have
an
impact
on
rice
yields
and
quality.
However,
surface
water
quality
has
received
less
attention
still
poorly
quantified,
mainly
due
to
low-frequency
measurements
at
field
scale
limited
capability
measure
different
parameters.
Therefore,
this
study
evaluated
a
two-year
experiment
assess
drainage
across
flooded
fields
cultivated
Histosols
flooding
under
four
depths-
5
cm,
10
15
20
cm.
On
average,
in
both
years,
all
treatments
reduced
total
suspended
solids
(TSS),
nitrogen
(TN),
phosphorus
(TP),
potassium
(TK)
loadings
40%,
38%,
36%,
32%,
respectively.
The
Canadian
Council
of
Ministers
Environment
Water
Quality
Index
showed
that
cm
had
favorable
index
compared
other
depths.
Results
indicated
no
significant
differences
yield,
therefor
be
as
optimal
for
Histosol.
With
application
starter
fertilizer
such
(N),
(P),
or
(K)
production
Histosol,
demonstrated
used
treatment
technology
improve
quality,
without
compromising
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(49), P. 20871 - 20880
Published: Nov. 29, 2023
Organic
acid
is
prevalent
in
underground
environments
and,
against
the
backdrop
of
biogeochemical
cycles
on
Earth,
holds
significant
importance
degradation
contaminants
by
redox-active
minerals.
While
earlier
studies
role
organic
generation
reactive
oxygen
species
(ROS)
primarily
concentrated
electron
shuttle
or
ligand
effects,
this
study
delves
into
combined
impacts
decomposition
and
Mackinawite
(FeS)
oxidation
contaminant
transformation
under
dark
aerobic
conditions.
Using
bisphenol
A
(BPA)
as
a
model,
our
findings
showed
that
oxalic
(OA)
notably
outperforms
other
acids
enhancing
BPA
removal,
attaining
rate
constant
0.69
h-1.
Mass
spectrometry
characterizations,
coupled
with
anaerobic
treatments,
advocate
for
molecule-O2
activation
principal
mechanism
behind
pollutant
transformation.
Comprehensive
results
unveiled
carbon
center
radicals,
initiated
hydroxyl
radical
(•OH)
attack,
serve
primary
agents
oxidation,
accounting
at
least
93.6%
total
•OH
generation.
This
dynamic,
driven
concurrent
formation
carbon-centered
ensures
steady
supply
electrons
ROS
The
obtained
information
highlights
OA
natural
attenuation
pollutants
offers
innovative
strategies
FeS
acid-coupled
decontamination.
•OH-based
oxidation
plays
a
crucial
role
in
dissolved
organic
matter
(DOM)
transformation
and
carbon
flux,
whereas
quantifying
the
contribution
of
this
pathway
remains
challenging.
Here
we
combined
concentration
with
isotope
analysis
DOM
its
generated
CO2
to
quantify
oxidation.
Results
showed
that
13C
enrichment
factors
(ε
values)
were
-8.1‰
-8.9‰
for
benzene
ring
aromatic
compounds,
-4.2‰
-28.9‰
lower-molecular-weight
acids,
-13.0‰
from
sediment.
The
fractionation
sediment
reflects
average
ε
value
humic
substances
acids.
These
values
more
negative
than
those
photochemical
microbial
processes,
enabling
identification
mechanisms.
Using
an
end-member
mix
model,
found
proportion
mineralization
total
emission
ranged
20.9%
39.8%
100
g/L
by
5-20
mM
H2O2
under
pH-neutral
condition
within
2
h
was
only
2%
air
same
conditions.
We
also
inorganic
degassing
contributed
greatly
during
This
study
presents
new
isotope-based
tool
quantitatively
assess
DOM.
Climate smart agriculture.,
Journal Year:
2024,
Volume and Issue:
1(1), P. 100005 - 100005
Published: June 11, 2024
In
the
Everglades
Agricultural
Area
(EAA),
Florida,
cultivating
rice
in
flooded
paddies
is
becoming
increasingly
popular
to
conserve
water
and
soil
health.
Flood
depth
a
critical
factor
affecting
discharged
quality,
carbon,
yield
production.
However,
few
studies
have
comprehensively
investigated
optimal
flood
EAA,
considering
multi-functional
indices.
To
address
this
gap,
we
drainage
quantity,
nutrient
uptake,
histosol
soils
over
two-year
period
at
four
depths
(5,
10,
15,
20
cm).
For
each
depth,
averaged
two
years,
total
outflow
loadings
of
suspended
solids,
nitrogen,
phosphorus,
potassium
were
significantly
reduced
by
40
%,
38
36
32
respectively,
compared
inflow
(p
<
0.001).
Total
phosphorus
uptake
∼11.21
kg
ha−1
shoots
0.48
roots,
while
∼4.28
0.13
roots.
Soil
organic
carbon
(SOC)
5,
cm
treatments
increased
annually
rate
3.85
5.64
6.86
respectively;
for
these
same
treatments,
active
(AOC)
decreased
rates
11.75
8.63
20.07
8.48
grain
was
4488,
5103,
5450,
5386
kg
ha−1,
respectively.
Overall,
SOC,
AOC,
production,
irrigating
15
most
effectively
improves
increases
sequestration,
reduces
yields
more
than
other
depths.
By
evaluating
effects
on
soil–water–plant
nexus
holistic
manner,
propose
sustainable
environmentally
friendly
mode
cultivation
within
EAA.
Reactive
oxygen
species
(ROS)
are
ubiquitous
in
redox-fluctuating
environments,
exerting
profound
impacts
on
biogeochemical
cycles.
However,
whether
ROS
can
be
generated
during
redox
manipulation
activated
sludge
wastewater
treatment
processes
(AS-WTPs)
and
the
underlying
remain
largely
unknown.
This
study
demonstrates
that
production
is
AS-WTPs
due
to
frequency
capacity
of
depend
operating
modes.
The
anaerobic/oxic
continuous-flow
reactor
showed
persistent
generation
(0.8-2.1
μM
instantaneous
H
