最終更新日：2022/12/24
The experiments made by the beet-root growers of the extensive tract of land in Russia, known as the Tschernosem or 'Black soil', whose fertility for corn plants is proverbial, show that this earth, though analytically proved to contain upon the whole, to the depth of twenty inches, 700 to 1000 times the quantity of potash required for a full beet-root crop, is, after three or four years' cultivation, so exhausted, that without manuring it will no longer yield a remunerative crop of beetroot.
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元となった例文
The
experiments
made
by
the
beet-root
growers
of
the
extensive
tract
of
land
in
Russia,
known
as
the
Tschernosem
or
'Black
soil',
whose
fertility
for
corn
plants
is
proverbial,
show
that
this
earth,
though
analytically
proved
to
contain
upon
the
whole,
to
the
depth
of
twenty
inches,
700
to
1000
times
the
quantity
of
potash
required
for
a
full
beet-root
crop,
is,
after
three
or
four
years'
cultivation,
so
exhausted,
that
without
manuring
it
will
no
longer
yield
a
remunerative
crop
of
beetroot.
