Environmental Engineering Reference
In-Depth Information
Plant Species
Four. species. of.
Eucalyptus
. were. used. as. seedlings. supplied. as. tube. stock.
by.commercial.suppliers:.
Eucalyptus cladocalyx
,.
Eucalyptus melliodora
.(yellow-
box),.
Eucalyptus polybractea
,.and.
Eucalyptus viridis
..Native.grasses.
Microlaena
stipoides
.(weeping.grass),.
Austrodanthonia caespitosa
.(wallaby.grass),.
Themeda
triandra
.(kangaroo.grass),.and.
Bothriochloa macra
.(red.grass).were.purchased.
from.the.Ballarat.native.seed.bank.and.commercial.suppliers.as.caryopses.or.
clean.seed..In.addition,.a.native.seed.collector.was.contracted.to.harvest.seed.
from.a.mixed.
Austrodanthonia
.grassland.
Experimentation
The.surface.of.Proto-TERF.was.pegged.to.a.randomized.block.design,.with.
three.blocks.replicating.10.different.covers..Each.of.the.30.experimental.plots.
had.dimensions.of.5.×.20.m.with.a.0.5.m.buffer.zone.between.each.plot..The.
plots.accommodated.the.following.covers/treatments:
1.. Tailings.
6.. 30.cm.oxide.waste.+.NPK.fertilizer
2.. Tailings.+.NPK.fertilizer.
7.. 30.cm.oxide.waste.+.10.cm.topsoil
3.. 5.cm.biosolids.fertilizer.
8.. 30.cm.oxide.waste.+.10.cm.topsoil.+.NPK
4.. 10.cm.biosolids.
9.. 30.cm.oxide.waste.+.5.cm.biosolids
5.. 30.cm.oxide.waste.
10.. 30.cm.oxide.waste.+.10.cm.biosolids
Native.grasses,.as.caryopses,.were.seeded.at.rates.equivalent.to.4.kg/ha.for.
Austrodanthonia
.sp.,.20.kg/ha.for.
M. stipoides
.and.10.kg/ha.for.
T. triandra
.
Field. trials. on. TERF. commenced. in. September. 2002.. Three. replicated.
blocks. (75.×.155.m). were. created,. with. each. containing. ive. treatment. plots.
(16.×.37.5.m).which.were.prepared.and.cultivated.to.a.depth.of.15.cm.with.a.
rotary.hoe..The.treatments.were.as.follows:
.
1.. Ploughed.tailings
.
2.. 10.cm.topsoil
.
3.. 10.cm.biosolids
.
4.. 30.cm.oxide.waste.+.10.cm.topsoil
.
5.. 30.cm.oxide.waste.+.10.cm.biosolids
In.the.inal.two.treatments,.milled.oxide.waste.that.had.been.allowed.to.dry.
for.2.months.was.spread.on.the.tailings.surface,.the.topsoil.or.biosolids.were.
spread.on.top,.and.the.surface.was.ploughed..Native.grass.seed.was.bulked.
with.topsoil.and.then.handsewn.at.the.same.rates.as.previously.employed.
on.proto-TERF.(10.kg/ha.for.
B. macra
)..Plots.allocated.to.tree.seedlings.were.
further. prepared. by. creating. a. furrow. to. a. depth. of. 30.cm. with. a. ripping.
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