FLORIDA STATE HORTICULTURAL SOCIETY. 
number of pounds taken and point off 
three figures—240 lbs. of sulphate of arm 
monia at $37.00 per thousand amounts to 
$8.80, which we write in the last column 
on the right. 
Dissolved boneblack contains 17 per 
cent, phosphoric acid and is worth $24 
pier ton. We need 120 lbs. available 
phosphoric acid to make 6 per cent. By 
annexing two ciphers to 120 and dividing 
by 17 we find it takes between 705 and 
706 lbs. boneblack. As we believe in 
good measure we take 706 lbs. which 
gives 120.02 A. P. A. and costs $8.47. 
We put all these amounts in their proper 
columns on the boneblack line. 
HHgh-grade sulphate of 'potash con¬ 
tains 48 per cent, potash and 1 costs $50.00 
per ton. We need 240 lbs. potash which 
necessitates buying 500 lbs. high-grade 
sulphate of potash. As 500 lbs. is just a 
quarter of a ton, we divide $50.00 by four 
and get $12.50 to complete our cost col- 
umjni. Oh no—not “complete" for to 
have our per cents right we must have a 
bulk of 2,000 lbs. and to get this we add 
554 lbs. land plaster at $12.00 per ton 
which amounts to $3.33. Then we allow 
$1.50 to pay for mixing and bagging and 
find the total cost to be $34.60. 
Do not object to that land plaster. You 
need it and it is worth the $12.00 per ton, 
but DO notice what you are buying and 
get your fertilizer for what it is worth. 
Probably the hardest formula to figure 
is one made with Peruvian Guano as a 
base. We will call this Peruvian manure 
and have our per cents, run 4-6-2-S; but 
in figuring the formula we count all the 
phosphoric acid together for one never 
tries to get a certain per cent, of insol¬ 
uble. Whatever insoluble matter there 
i ?.l 
is in any formula naturally accompanies 
the soluble matter or in treated goods is 
proof that no “free acid’’ exists. Besides 
the guano we will use nitrate of soda, 
sulphate of ammonia, ground bone and 
sulphate of potash. Guano varies in its 
percentages and is bought on its analysis 
so we find no standard price and content. 
For our purpose today, we will take fig¬ 
ures from a trade list that is out of date—* 
ammonia 31-2 per cent., phosphoric acid 
16 per cent, potash 2 per cent., price 
$32.00 per ton. We have been told that 
900 lbs. guano is a good foundation so we 
start with that:—900 lbs. Guano gives 
31.50 lbs. ammonia, 144 lbs. phosphoric 
acid and 18 lbs. potash and costs 
$14.40. We write all these amounts in 
their proper columns. 
As we are to get the rest of the phos¬ 
phoric acid from ground bone we make 
that the next item. Its content is am¬ 
monia 4 per cent and phosphoric acid 22 
per cent, and its price is $32.00 per ton. 
As we need 16 lbs. more phosphoric acid 
we take 73 lbs. ground bone which gives 
us 16.06 lbs. P. A. and also 2.92 lbs. am¬ 
monia and costs $1.17; all of which we 
enter in the proper places. We still lack 
45.58 lbs. ammonia. We will use 100 lbs. 
sulphate of ammonia to give 25 lbs. and 
to cost $3.70 ; and 122 lbs. nitrate of soda 
which contains 17 per cent, ammonia and 
costs $60.00 per ton; therefore from the 
nitrate we got 20.74 lbs. ammonia at a 
cost of $3.66. 
Our guano gave 18 lbs. potash and 
547 lbs, L. G. sulphate of potash analyz¬ 
ing 26 per cent. K2O, price $30.00 per 
ton supplies 142.22 lbs. potash and costs 
$8.20. Our ton is completed by the addi¬ 
tion of 258 lbs. land plaster for $1.55, 
