The herald and news. [volume] (Newberry S.C.) 1903-1937, 1908-12-08

ties claim that the Sulphate Is DeIter.
We can obtain our supply OF acid
phosphate from IT, IL PER cent or l6
per cent article. When prices are
proportionate, the higher grade is pre-
ferable because we can haul more
pounds Of plant food in a given weight
Of the material. When buying these
materials, do not be afraid to waste
few postage stamps in writing to
number Of firms. If your farm does
not warrant your ordering carload
Of raw materials, then form a club
and order together, there being no dif-
ficulty in dividing goods that are al
ready sacked.
2. We now come to the subject Of
calculations. A unit is l per cent Of
a ton or 20 pounds. IF We wish an
8-3-3 guano, we must have in ton 8
units Of .phosphoric acid, 3 units OF
ammonia or its equivalent N nitrogen,
and 3 units Of potash. Converted to
pounds we have 160 pounds Of phos-
phoric acid, so pounds Of ammonia,
and 60 pounds Of potash. Suppose, IN
mixing our fertilizer, we wish one
half of our ammonia derived from nj
trogen of cotton seed meal guaranteed
l 1851, and the other half from nj
trogen of nitrate Of soda equivalent Is
per cent ammonia, the potash (K2O)
from muriate so per cent K2o, and
the phosphori acid, from 10 per cent
acid phosphate.
We get the number Of hundred
pounds Of material to supply given
amount Of plant food by dividing the
amount Of plant food desired by the
per cent contained in the material.
429 pounds of cotton seed meal fur
nishes nitrogen equivalent to 81
pounds of ammonia but it furnishes IN
addition 6.44 lbs. phosphorie acid and
4.29 lbs. Of potash. l67 lbs. OF nj
trate Of soda furnishes nitrogen equ1-
valent to 80 lbs. Of ammonia, but no
potash or phosphoric acid. 96o lbs.
If acid phosphate furnishes lo3'oo
lbs. of phosphoric acid and the cotton
seed meal furnishes GA lbs. 50 we
have the 16O lbs. required. Similarly
i'll lbs. of muriate Of potash furnish
es 55-71 lbs (K20) potash. We now
have the necessary plant food for an
S-3-3 guano in 1867 lbs. Of material.
Just add 333 lbs. Of dirt and mix
thoroughly and We have a ton by
weight containing l6O lbs. Of phos-
phoric acid, so lbs. Of ammonia, and
so lbs. Of potash, which, if properly
mixed should analyze 8-3-3.
Suppose that We had used 400 lbs.
Of cotton seed meal, 200 lbs. Of nj
trate of soda, 100 lbs. Of muriate OF
potash and 1000 lbs. Of 16 per cent
acid phosphate, it being more conven-
lent 10 use full sacks and avoid lot
of weighing.
Many factory mixed fertilizers do
not come this close to guarantee.
To get high grade mixed fertilizers,
we must use high grade raw materials.
In the above formula, if no filler IS
added. we would divide by II instead
of 20 and would have 100 lbs. OF
what should analyze about 9.76-3.763.-
Is. It is obvious that We cannot get
an 8-4-4 goods by getting all OF our
ammonia from cotton seed meal and
all of our potash from kainit.
Very likely the above mentioned
mixture would RIM. slightly over guar
antee. because the seller would have to
allow. or should allow. margin on
each of his raw materials. whereas. in
a mixed fertilizer one. or even two OF
the elements. may be below guarantee
and the other might pull it over in
relative commercial value.
3. ANY tight floor will do to do
the mixing on. but it is preferable
10 have a house or shed. FOR it Will
then be possible to do the mixing on
rainy davs. when very little else
could be done.
A practical farmer who does his
own mixing tells me that he had three
hands to do the mixing. two rakins
with hoes and one shovelling it over
constantly. They used about 8OO lbs.
ot time and as soon as it was thor
orohlv mixed. prt it back into the
socks that the raw material came ont
Of. The work of mixing should he
done at about one dollar ner ton. The