Computers and Electronics in Agriculture,
Год журнала:
2023,
Номер
213, С. 108236 - 108236
Опубликована: Сен. 19, 2023
Crop
fertilizer
recommendations
that
are
site-specific
and
can
be
adjusted
in
multiple
growth
stages
result
improved
nutrient
management,
use
efficiency,
grain
yield.
There
considerable
challenges
to
collecting
a
large
number
of
soil
crop
samples
using
the
traditional
methods,
so
modern
approach
developing
is
urgently
needed.
In
this
study,
we
used
topdressing
recommendation
method
based
on
unmanned
aerial
vehicle-based
hyperspectral
images
conducted
long-term
nitrogen–phosphorus–potassium
(NPK)
combined
experiment
spring
maize
cropping
system.
The
imagery
was
acquired
at
critical
(jointing,
silking,
maturity)
experimental
field
containing
120
microplots
during
2019–2020.
leaf
nitrogen
content
(LNC)
yield
measurement
data
for
each
microplot
were
also
collected
stages.
Ten
narrowband
vegetation
indices
(VIs)
derived
from
as
effective
indicators
estimation
N
status
To
develop
stages,
first,
optimal
NPK
amounts,
which
applied
total
requirement
achieve
highest
yield,
obtained.
Second,
thresholds
VIs,
justify
if
needed,
calculated
regression
model
established
relative
VIs.
Finally,
amounts
already
jointing
silking
obtained
response
VIs
amounts.
results
reveal
amount
180
kg
ha−1,
by
combination
P
K
fertilizers.
Five
significantly
correlated
with
both
LNC
these
below
identified
95%
five
all
presented
high
fitting
accuracies
applied.
However,
there
noticeable
differences
sensitivities
Therefore,
developed
cost-effective
provide
multi-stage
scale
This
benefit
other
precision
agriculture
applications
incorporated
remote
sensing
techniques.
Frontiers in Sustainable Food Systems,
Год журнала:
2025,
Номер
8
Опубликована: Янв. 14, 2025
The
excessive
use
of
chemical
fertilizers
in
agricultural
production
has
led
to
diminishing
returns,
necessitating
alternative
methods
enhance
soil
fertility
and
reduce
fertilizer
dependency.
One
promising
approach
is
the
integration
leguminous
green
manure,
which
improves
structure,
enhances
nutrient
cycling,
supports
sustainable
farming
practices.
However,
application
manure
systems
with
continuous
reduction
remains
underexplored.
This
study
addresses
this
gap
by
investigating
effects
reducing
nitrogen
phosphorus
(N-P)
up
24%
conjunction
multiple
cropping
soybean
on
fertility,
organic
carbon
fractions,
wheat
yield.
research
employed
a
pot
experiment
conducted
over
two
wheat-growing
seasons
(March
2021
July
2022)
at
an
experimental
station
Baoji,
China.
Treatments
included
CK
(control,
no
fertilizer),
CF
(conventional
reduced
N-P
applications
6%
(RF6),
12%
(RF12),
18%
(RF18),
(RF24).
Key
findings
revealed
that
RF12
had
significant
impact
grain
yield
compared
CF.
incorporation
significantly
improved
alkaline
22.3%
available
30.7%,
while
high-labile
(H-LOC)
microbial
biomass
(MBC)
increased
34.5
29.6%,
respectively.
Additionally,
notable
increase
12.4%
content
was
observed,
suggesting
enhanced
sequestration
potential.
provides
valuable
insights
into
practices
demonstrating
incorporating
alongside
moderate
can
maintain
crop
yield,
improve
availability,
content,
thus
supporting
reliance
promoting
long-term
sequestration.
Field Crops Research,
Год журнала:
2022,
Номер
284, С. 108578 - 108578
Опубликована: Май 30, 2022
Reliable
estimates
of
crop
nitrogen
(N)
uptake
and
offtake
are
critical
in
estimating
N
balances,
use
efficiencies
potential
losses
to
the
environment.
Calculation
requires
yield
product
(e.g.
grain
or
beans)
residues
straw
stover)
concentration
both
components.
Yields
products
often
reasonably
well
known,
but
those
not.
While
harvest
index
(HI)
can
be
used
interpolate
quantity
residue
from
available
data
on
yields,
indices
known
vary
across
locations,
as
do
concentrations
products.
The
increasing
availability
advanced
statistical
machine
learning
methods
present
us
with
an
opportunity
move
towards
more
locally
relevant
using
readily
data.
aim
this
study
was
investigate
whether
improved
maize
HI
based
at
global
scale,
such
yield,
fertilizer
application
rates
potential.
Experiments
1487
different
locations
conducted
31
countries
were
test
various
prediction
models.
Predictions
mixed-effects
models
random
forest
provided
reasonable
levels
accuracy
(R2
between
0.33
0.68),
method
having
greater
accuracy.
Although
had
lower
than
forest,
they
did
provide
better
interpretability.
Selection
which
will
depend
objective
user.
Here,
applied
maize,
could
equally
other
crops
nutrients,
if
becomes
available.
This
enable
obtaining
nutrient
improve
balances
efficiency
national,
regional
levels,
part
strategies
sustainable
management.
Frontiers in Plant Science,
Год журнала:
2022,
Номер
13
Опубликована: Июнь 6, 2022
Appropriate
fertilizer
application
methods
can
help
to
improve
crop
yields.
However,
limited
information
is
available
regarding
how
different
depths
might
affect
production
in
dryland
winter
wheat-summer
maize
cropping
the
Loess
Plateau
region
of
China.
Therefore,
we
conducted
field
experiments
2019-2020
and
2020-2021
evaluate
effects
changing
placement
depth
on
summer
(current
crop)
wheat
(succeeding
productivity,
as
well
resource
use
efficiency
soil
nitrate-nitrogen
residue
(SNR)
level.
Four
were
tested
comprising
5
cm
(FD5),
15
(FD15),
25
(FD25),
35
(FD35).
The
nitrogen
uptake
by
two
seasons
was
10.0,
6.5,
11.8%
higher
under
FD15
compared
with
those
FD5,
FD25,
FD35,
respectively,
because
effectively
increased
root
length
density,
surface
area
rate
bleeding
sap.
Due
uptake,
leaf
index,
plant
height,
stem
diameter,
accumulated
dry
matter
improved
maize.
interception
photosynthetically
active
radiation
3.6,
3.7,
5.9%
respectively.
grain
yield
13.9-22.4%
other
treatments.
In
addition,
SNR
deep
(200-300
cm)
significantly
lower
during
harvest
(17.9-30.7%)
Moreover,
(2.6-11.2%)
reduced
200-300
layer
(8.8-16.8%)
at
harvest.
highest
efficiency,
precipitation
obtained
both
wheat.
These
results
clearly
suggest
that
fertilization
enhanced
productivity
for
current
subsequent
crops
rainfed
farmland
China,
reducing
promote
sustainable
agricultural
development.
findings
provide
a
practical
reference
optimizing
management.
