13 



In the following tahle i-'/ivcn tliecoM per ton of the dillerent ferti- 

 lizers mentioned in Table X and the cost per pound of the principal 

 fertilizing elements contained therein. In Table XI I will he found the 

 cost of the various mixtures as applied, per acre. 



TABLE XL 





In the above table it will be noted that in estimating the cost of 

 the fertilizing elements per pound only the principal one has been 

 selected and the whole cost of the fertilizer charged to that. This is 

 of course an unobjectionable method, provided the fertilizer contains 

 only one element, as was the case with the acid phosphates of kainit and 

 muriate of potash above mentioned. In the case of cotton-seed meal 

 the phosphoric acid and the potash, however, are worth something, 

 and hence the value of these should be deducted from the total expense, 

 and their value should not be charged to the nitrogenous element alone. 

 In making this change we find that the cotton-seed meal contained 1.82 

 per cent of potash, or 36.4 pounds per ton, which, at 5 cents per pound, 

 amounts to $1.82. The cotton-seed meal contained also l.Di; percent 

 of available phosphoric acid, which, at 4 cents per pound and :tt.2 

 pounds per ton, amounts to $1.57. Potash and phosphoric acid 

 together, therefore, are worth $3.39. Deducting this from the price 

 per ton of cotton-seed meal, namely, $23.50, we find the value of the 

 nitrogenous element to be $20.11. Dividing this by the number of 

 pounds of nitrogen reckoned as ammonia, namely, 158.8, we find the 

 price of the ammonia to be 12.6 cents per pound. 



In determining the cost of phosphoric acid and potash per unit it 

 will be seen that the high-grade fertilizers furnish these elements at a 

 cheaper rate than the low grade. For instance, the guaranteed 16 per 

 cent acid phosphate supplies phosphoric acid at 3 cents a pound, while 

 the guaranteed 13 per cent available phosphoric acid supplies this ele- 

 ment at 4<cents per pound. It will be noticed in both cases that the acid 

 phosphates were above the guarantee in available phosphoric acid, one 

 being 0.36 per cent and the other 1.96 per cent above the guarantee. 



