The herald., 1897-12-30
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superphosphate. on loans. or on sandy
land on soils rich or very poor In phos-
phoric acid, with all kinds Of crops;
either in the first or In succeeding crops.
Fifth-The various kinds Of bone meal
show no essential difference in their re-
suits.
sixth-The best form in which to ap-
ply bone meal il as dissolved bone meal,
l. e.. mixed with e0-degree sulphuric acid,
at the rate OF 20 per cent for raw, and 40
per cent for glue-free bone meal.
Seventh-For stocking land with a
supply of phosphoric acid. dissolved
bone meal is better adapted than Is su-
|perphosphate.
/ Wagner's experiments were SO elab-
crate and cautious that, although revo-
lutionary In their influence, they at once
made a profound impression. The results
showed only five or eight pounds gain
with bone meal. as against 100 pounds
with superphosphates and the after
cffect Of the bone meal was also greatly
behind that of the superphosphates. To
quote from the Bulletin: 1.-THE Wagner
experiments awakened solicitude among
the bOne-meal manufacturers, and this
doubtless was the reason why the Bone
Meal Manufacturers association of Sax
ony appealed to the Halle experiment
station to test the question and appro-
priate for this purpose a. considerable
sum-. The experiments at Halle were
four years In progress; were not only
deliberate, but were performed with ex-
ceeding caution, and sustained entirely
the conclusions previously reached by
Wagner. The results proved sore dis
appointment to the vendors of bone
meal, and as great a surprise to the ex-
perimenters. To quote again from the
Bulletin: 1.-THE claim has been made
that this mode Of testing Tin Wagner's
vegetation pots) is not fair one for the
bone meal, because the latter cannot act
so effectively as In the open field. 1t has
been repeated shown, however, that
with every other kind of fertilizing ma
terial results are obtained in the pots
fully as favorable to the fertilizer as
those obtained In The field. Generally,
they are more favorable. There is no
good reason for supposing the method
to be prejudicial to the interests Of bone
meal alone. No pains were spared to so
arrange the tests as to get, If possible,
favorable results from the bone meals.
Not in q single instance has such an
end been reached" The Halle expert
menters were cautious to procure good
average samples Of meal in all their
work, which were supplied by the Sax
ony Bone-Meal Manufacturers associa-
ton.
The conclusions, then, are that bone
meal is almost valueless, except for the
nitrogen which 1t contains. either for
present or future uses. The same thing
is true of superphosphates made by dis
solving bone meal in sulphuric acid, un-
less limited amount of acid be used. To
quote: THE experiments show, there
fore, that by small addition of sui
phuric acid to bone meal. fertilizers are
produced which in their first effect stand
very near the superphosphates, and.
under some circumstances, equal them.
In their after-effects they are very good,
and. in the long run, better than the
superphosphates Enough has been said
to show the Importance Of this subject
and to suggest to the orchardists large
saving in their practice, with no loss to
their income. In a future number of The
Herald will describe the several kinds
of phosphoric-a fertilizers, their or
igin, makeup and relative value.