207 
Or again, bonedust contains :— 
Nitrogen 4 ae sibs aie 3°16 per cent. 
Phosphoric Acid iy nd igs 20-20 
” 
Mechanical Condition— 
Fine bone 28 i one os 42 per cent. 
Coarse bone 8 
” 
After working out the relative percentages of nitrogen and 
of phosphorie acid, as fine and coarse bone, multiply these per- 
centages by their unit value and add together the products :— 
eae ee aaa .. 3°16 per cent. x 74%, = 1-32 as fine bone. 
-. 3°16 3 xX 25 = 1-833 as coarse bone. 
Bieaphewe Acid . . 20:20 * x 4% = 8-48 in fine bone. 
Do. s+ 20°20 3 x $8 = 11-71 in coarse bone. 
Percent. Unit Value. Value per ton. 
£ os. d. 
1:32 «x 16/- = 1410 0 
1:83 x l4/- = 1 5 9 
848 x 5/- = 2 2 5 
7] x 4/4 = 299 
Unit Value » £619 2 
It is thus seen that the price per unit is obtained by multiply- 
ing the percentage of each ingredient by the price of a unit, or 
conversely by dividing the price per ton by the percentage of the 
fertilisers and adding together the products. 
In this manure the purchaser can arrive at a fair value of the 
manure offered to him, to which, of course, must be added the cost 
of carriage from the manure works. 
EFrrect OF FERTILISERS ON FRUIT CROPS. 
Experiments made a few years ago in the State of Missouri 
brought to light the fact that twigs, fruit spurs, spurs with fruit 
set, of apples, analysed, showed that the much larger amount of 
lime, phosphoric acid, and potash in the bearing twigs is very 
marked as compared with non-bearing twigs. It would thus seem 
that the effect of fertilising fruit trees cannot possibly manifest 
itself in the same year in an increased fruit crop, but appears to a 
certainty the year after, and that fruit growers, in valuing fertil- 
isers, must bear this in mind to arrive at a correct conclusion of 
the action of manures on their fruit crop. 
Speaking in a broad sense, nitrogen, applied as a fertiliser, 
produces wood and leaves; phosphates produce fecundity and a 
brightness of colouring ; and potash produces sweetness and 
flavour; gypsum and sulphate of iron help to fix the fruit on the 
tree. 
