In
recent
years,
the
increasing
number
of
biogas
plants
in
operation
has
also
led
to
a
considerable
rise
in
fermentative
substrates,
which
are
now
widely
used
as
agricultural
fertilizers.
The
impact
on
earthworm
fauna
of
using
biogas
digestate
as
a
fertilizer
has
yet
to
be
sufficiently
researched.
At
two
different
tests
sites,
the
short-term
(four
months
after
fertilization)
and
longer-term
(three-year
test
period)
influence
of
using
fermented
residues
as
a
fertilizer
was
examined
on
earthworm
density,
biomass
and
community
composition
compared
to
using
traditional
fertilizers
(cattle
and
pig
slurry,
chemical
fertilizers
as
well
as
an
unfertilized
control).
The
crop
grown
was
maize
(
Zea
mays
L.).
Applying
biogas
digestate
and
slurry
had
a
positive
overall
impact
at
both
sites
on
earthworm
density
and
biomass.
Observing
different
fer-
tilization
regimes
in
the
short
term,
the
significantly
highest
earthworm
density
was
seen
where
slurry
had
been
applied.
In
the
treatments
with
digestate
and
conventional
slurry,
earthworm
biomass
differed
significantly
in
comparison
with
chemical
fertilization
and
the
untreated
variant.
After
three
years,
earth-
worm
biomass
in
the
variants
fertilized
with
conventional
slurry
and
digestate
tended
to
be
higher
than
in
the
chemical
fertilizer
and
untreated
variants.
Community
composition
was
strongly
influenced
by
the
application
of
digestate.
A
decrease
in
the
species
Aporrectodea
rosea
was
accompanied
by
an
increase
in
Aporrectodea
caliginosa
.
The
earthworm
population
was
supported
equally
positively
at
both
sites
by
the
variants
with
conventional
slurry
and
digestate
Inrecentyears,theincreasingnumberofbiogasplantsinoperationhasalsoledtoaconsiderableriseinfermentativesubstrates,whicharenowwidelyusedasagriculturalfertilizers.Theimpactonearthwormfaunaofusingbiogasdigestateasafertilizerhasyettobesufficientlyresearched.Attwodifferenttestssites,theshort-term(fourmonthsafterfertilization)andlonger-term(three-yeartestperiod)influenceofusingfermentedresiduesasafertilizerwasexaminedonearthwormdensity,biomassandcommunitycompositioncomparedtousingtraditionalfertilizers(cattleandpigslurry,chemicalfertilizersaswellasanunfertilizedcontrol).Thecropgrownwasmaize(ZeamaysL.).Applyingbiogasdigestateandslurryhadapositiveoverallimpactatbothsitesonearthwormdensityandbiomass.Observingdifferentfer-tilizationregimesintheshortterm,thesignificantlyhighestearthwormdensitywasseenwhereslurryhadbeenapplied.Inthetreatmentswithdigestateandconventionalslurry,earthwormbiomassdifferedsignificantlyincomparisonwithchemicalfertilizationandtheuntreatedvariant.Afterthreeyears,earth-wormbiomassinthevariantsfertilizedwithconventionalslurryanddigestatetendedtobehigherthaninthechemicalfertilizeranduntreatedvariants.Communitycompositionwasstronglyinfluencedbytheapplicationofdigestate.AdecreaseinthespeciesAporrectodearoseawasaccompaniedbyanincreaseinAporrectodeacaliginosa.Theearthwormpopulationwassupportedequallypositivelyatbothsitesbythevariantswithconventionalslurryanddigestate
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