We cannot afford $40 per ton for low grade analysis, 

 but can well pay $40 for high grade-goods. Freight, 

 sacking, storage and handling are fixed expenses on 

 low or high grades. Therefore, high grades are 

 cheapest. 



The way to figure the difference in value between 

 several brands of fertilizer is as follows: 



Take nitrogen at 16 c. per pound, phosphoric 

 acid at 5% c. per pound, potash (actual) at 6 c. per 

 pound. 



(Note. These values are based on the cost of 

 nitrate of soda, and sulphate of potash laid down in 

 inland California points.) 



Remember that 1 % or one unit of a ton is 20 

 pounds. 



If ammonia is given instead of nitrogen you can 

 find its equivalent in nitrogen by multiplying by 

 .825%; for instance, 5^2% ammonia equals 4.54% 

 nitrogen. 



Do not multiply the percentage of ammonia by 

 20 and then by 16c. as it then would read too much, 

 but must first be reduced to terms of nitrogen. 



Also do not confuse sulphate of potash with the 

 actual (or K2O) potash. The sulphate usually runs 

 about 49 % actual. So, in round numbers, it takes 2 

 pounds of sulphate to make one pound actual, or 2% 

 sulphate to make 1 % actual. 



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