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FF
enumerated
follo ws
n
xt to this ash
mountain a sh
oak
orway mapl
chestnut
pine
bir ch
r t from wate r and ga ses
pa
an d organic substances
r
t
s
partly by providing nouris
mining
r eater po r tion of th
the g
specially ca
substances
r tain the actual quantities of such substances in the
to asc
plant
The conte
r ts
pa
contain s l
s s than
branch
s and
l
aves and needles f
h e quan
t
ities
important substanc
soil
acre and year
h e data of t h i s table j ustify the following conclusions
T
The sub stances requi
h e same as thos
t
e
c
and wood
nearly as m uch mineral substances a s an average
h
P
T O F
I L
O
a bove
most poplars and willows
pedunculate oak
Corsican pine
obinia and aspen
h ysical propertie
p
r bon
but a certain portion
r ived from the soil
is de
ts
r
t
e
thus wood taken f
r cent
pe
wigs a
out
r om
as
hown in
s
which an average crop takes from t
r equired by field crops
h h igh fo r
st r
h
h
s
l
s
T V
F O R
the rest
they m ay be classified as
pine
ilver fir
pruce
r e
sycamo
the soil con sists of min
T hese af
ect the d
h ment
of
r nourishm
i
H
mineral sub stances va
h es
of as
per cent
per cent
a ble on pag
t
r ed by forest trees a r e
quires
for t
T A TI O N
Common alder
hornbeam
larch
beech
ymouth pine
cotch pine
velopm
and par
ly by d eter
soil
nt from the ai
incl
ding t
ence
it i s of impo
r y in di
r om t h e st
r ding to w
acco
r k
ba
pe
qualitatively
h e production of leaves
V
l
p
elm
lime
sessile
swe
t
ustrian
r al
h e
nt of t
r
more
h e mine r al
r tance
erent
m gen
rally
ight
r cent
and
give s
of
more
h e
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