Nutrient Cycling in Agroecosystems,
Journal Year:
2022,
Volume and Issue:
125(2), P. 95 - 106
Published: April 11, 2022
Abstract
Irrigated
cotton
in
Australia
is
mainly
grown
on
heavy
textured
soils
which
are
prone
to
waterlogging,
resulting
significant
losses
of
nitrogen
(N)
via
denitrification
and
surface
run-off.
This
study
investigated
fertiliser
use
efficiency
(fNUE)
over
three
seasons
five
commercial
farms
using
the
15
N
tracer
technique.
Fertiliser
NUE
was
consistently
low
across
all
fertilised
treatments,
with
average
47%
applied
lost
only
17%
taken
up
by
crop
derived
from
fertiliser.
There
no
effect
different
products
rates
lint
yield.
High
yields
(0.9–3.6
Mg
ha
−1
)
could
be
achieved
even
without
application
fertiliser,
demonstrating
mineralisation
soil
organic
N,
residual
or
returned
residues,
as
key
source
these
cropping
systems.
Using
nitrification
inhibitor
DMPP
overhead
instead
furrow
irrigation
showed
potential
reduce
losses.
The
results
demonstrate
that
under
current
on-farm
management
fNUE
irrigated
highlight
need
account
for
stocks
when
assessing
optimized
rates.
substantial
scope
improve
any
impact
yield,
adjusting
rates,
particular
combination
DMPP.
a
promising
approach
not
water
efficiency,
but
also
Global Ecology and Biogeography,
Journal Year:
2023,
Volume and Issue:
32(6), P. 919 - 930
Published: March 29, 2023
Abstract
Aim
The
Paris
Climate
Agreement
is
pursuing
efforts
to
limit
global
warming
less
than
2
°C
in
this
century,
but
increasing
evidence
shows
that
temperatures
are
likely
rise
up
4.8
by
2100.
This
points
an
urgent
need
investigate
how
the
temperature
impact
on
microbial
regulation
will
endanger
soil
organic
matter
stability
under
approaching
or
exceeding
°C.
Location
Southern
Germany
and
globe.
Time
Period
2010–2018.
Major
Taxa
Studied
Soil
adaptations.
Methods
We
analyzed
properties
enzyme
activities
within
(a)
a
long‐term
field
experiment
with
below
above
(+1.6
vs.
+3.2
°C),
(b)
literature
review
of
213
comparable
studies
globally
(+0–2
+2–4
°C).
Results
C
(SOC)
stock
remained
unchanged
after
8
years
both
magnitudes,
whereas
labile
pool
increased
10%
>2
Unlike
SOC
pool,
total
N
(TN)
content
20%
as
compared
ambient.
A
potential
explanation
for
TN
linked
unbalanced
processes
necromass
formation
enzymatic
decomposition.
Warming
induced
faster
growth
turnover,
reduced
catalytic
efficiency
enzyme‐mediated
decomposition
oligosaccharides
polypeptides.
consequently
caused
accumulation
necromass.
Although
can
maintain
at
stable
levels,
change
projected
effects
pools
future.
Early
action
accomplish
goal
therefore
markedly
reduce
likelihood
large
regions
face
substantial
increase
availability,
related
climate
impacts
cycling.
Main
Conclusions
It
crucial
include
metabolic
responses
(i.e.,
turnover)
cycle
models
improve
prediction
scenarios.
Nutrient Cycling in Agroecosystems,
Journal Year:
2019,
Volume and Issue:
116(1), P. 41 - 56
Published: Oct. 23, 2019
Abstract
Improving
fertiliser
nitrogen
(N)
use
efficiency
is
essential
to
increase
productivity
and
avoid
environmental
damage.
Using
a
15
N
mass
balance
approach,
we
investigated
the
effects
of
five
management
strategies
test
hypothesis
that
increasing
uptake
applied
by
wheat
improves
reduces
loss
in
semi-arid
environment.
Three
experiments
were
conducted
between
2012
2014.
Treatments
included
urea
application
(50
kg
N/ha)
at
sowing
with
without
nitrification
inhibitor
(3,4-dimethylpyrazole
phosphate,
DMPP)
surface
broadcast
urease
(
n
-butyl
thiophosphoric
triamide,
NBPT)
end
tillering
plus
an
unfertilised
control.
It
was
found
deferring
until
decreased
losses
(35–52%)
through
crop
or
recovery
soil
harvest,
while
maintaining
yield
except
when
rainfall
following
low.
In
this
case,
reduced
(−
71%)
grain
18%)
increased
(+
121%).
Use
DMPP
NBPT
where
seasonal
conditions
conducive
denitrification
during
winter
(DMPP)
volatilisation
later
season
(NBPT).
Their
effect
on
less
significant;
3–31%)
all
years
7–11%)
2
3
compared
unamended
urea.
The
majority
supplied
from
reserves
as
result,
not
strongly
related
response.
Scientific Reports,
Journal Year:
2020,
Volume and Issue:
10(1)
Published: Feb. 12, 2020
Abstract
Nitrification
inhibitors
(NIs)
have
been
shown
to
reduce
emissions
of
the
greenhouse
gas
nitrous
oxide
(N
2
O)
from
agricultural
soils.
However,
their
N
O
reduction
efficacy
varies
widely
across
different
agro-ecosystems,
and
underlying
mechanisms
remain
poorly
understood.
To
investigate
effects
NI
3,4-dimethylpyrazole-phosphate
(DMPP)
on
N-turnover
a
pasture
horticultural
soil,
we
combined
quantification
with
15
tracing
analysis
O-reductase
gene
(
nosZ
)
in
soil
microcosm
study.
Nitrogen
fertilization
suppressed
abundance
both
soils,
showing
that
high
nitrate
availability
preferential
over
is
responsible
for
large
pulses
after
DMPP
attenuated
this
effect
only
reducing
nitrification
while
increasing
abundance.
reduced
by
>50%
but
did
not
affect
overall
+
losses,
demonstrating
shift
O:N
ratio
towards
as
key
mechanism
mitigation
NIs.
Under
non-limiting
NO
3
−
availability,
NIs
mitigate
therefore
depends
ability
suppression
reductase
concentrations
enabling
complete
denitrification
.
Soil Biology and Biochemistry,
Journal Year:
2017,
Volume and Issue:
116, P. 193 - 202
Published: Oct. 24, 2017
Nitrification
inhibitors,
originally
proposed
for
nitrate
leaching
mitigation,
are
recommended
as
effective
nitrous
oxide
(N2O)
mitigation
strategies.
Several
compounds
have
been
trialled
and
used
in
the
past
including
dicyandiamide
(DCD)
or
3,4-dimethylpyrazole
phosphate
(DMPP).
Yet,
little
is
known
about
new
nitrification
inhibitor
2-(3,4-dimethyl-1H-pyrazol-1-yl)
succinic
acid
isomeric
mixture
(DMPSA).
A
field
experiment
using
15N
single-labelled
ammonium
(15NH4NO3
NH415NO3)
was
conducted
to
understand
effectiveness
of
DMPSA
on
a
biochemical
basis
an
irrigated
maize
(Zea
mays
L.)
crop.
Gaseous
fluxes,
i.e.
N2O,
15N2O,
15N2,
methane
(CH4),
carbon
dioxide
(CO2)
were
measured,
well
soil
mineral
N,
yield
components
recovery
plant
soil.
During
cropping
period,
use
significantly
reduced
cumulative
N2O
emissions
(118
g
N
ha−1)
compared
without
(231
ha−1).
The
analyses
revealed
that
most
losses
(particularly
during
emission
peak)
came
from
15NH4NO3
(i.e.
nitrification,
nitrifier
denitrification
and/or
coupled
denitrification)
rather
than
NH415NO3
this
calcareous
low
C-content
As
expected,
decreased
15NH4+
oxidation,
but
effect
non-target
microorganisms
noticed,
shown
by
significant
reduction
respiration
rates
coming
15NO3−.
No
CH4
oxidation
15N2
fluxes
observed.
did
not
lead
improvement
dry
weights
grain
biomass,
although
increment
root
biomass
64%
found.
This
compound
also
tended
increase
(average
67.8%)
decrease
18.3%)
differences
statistically
significant.
Conversely,
residual
fertilizer-N
15–30
cm
30–45
layers.
confirmed
highly
tool
reduce
crops
semi-arid
areas.
Archives of Agronomy and Soil Science,
Journal Year:
2020,
Volume and Issue:
66(14), P. 2039 - 2054
Published: Jan. 6, 2020
Rice–wheat
(RW)
cropping
system
in
India
is
a
major
source
of
N2O
emissions.
In
such
system,
defining
N
rates
that
deliver
minimal
emissions
and
economically
optimum
yield
would
benefit
both
food
production
the
environment.
We
measured
fluxes
from
RW
systems
Northwest
IGP
under
two
tillage
five
(0,
75,
150,
225
300
kg
ha−1)
for
rice
wheat
using
static
chamber
method.
Seasonal
pattern
emission
was
mainly
influenced
by
fertilizer
water
application
events
with
no
significant
effect
systems.
Mean
annual
1.49
ha−1
N75
plot
2.97–3.04
plots
receiving
≥150
ha−1.
On
average,
yield-scaled
were
0.25
0.52
N2O–N
mg−1,
respectively.
Our
finding
suggests
between
120–200
50–185
provide
most
economical
returns
beyond
these
ranges
be
environmentally
unsustainable.
Within
range
rate
studied,
fertilizer-induced
N2O-EF
0.41%
0.79%,
