FERTILIZERS FOR COTTON 53 



The figures quoted express the actual cost 

 of the materials, so by the time such a fertilizer 

 reaches the farmer it will cost him nearer 25 

 per ton. The difference between the value of 

 materials and the price the farmer pays repre- 

 sents the cost of mixing, and bagging, and the 

 profits. 



It will be found that all materials used 

 in mixing fertilizers vary in the amount 

 of plant food contained in them. Taking 

 acid phosphate for example, we find some 

 running as low as 10 pounds of available 

 phosphoric acid per 100 pounds, while the 

 best grade runs as high as 16 pounds or 

 more per 100 pounds. On this basis, val- 

 uing phosphoric acid at 5 cents per pound, 

 the first would cost 50 cents, whereas the 

 latter would cost 80 cents. Even greater 

 differences will be found in the grades of cot- 

 tonseed meal. 



Samples of cotton seed meal can now be found 

 ranging from 3.5 per cent, to 7 per cent, of 

 nitrogen. Basing the values on the nitrogen 

 contained, Table II shows the relative values 

 of cotton seed meal of the different grades. It 

 is assumed that cotton seed meal containing 



