15 



Cents per Pound. 

 1914 1915 



Organic nitrogen in mixed fertilizers 19.5 19. 



Organic nitrogen in cottonseed meal, castor 



pomace, linseed meal, etc 22 .5 20 . 



Phosphoric Acid. 



Soluble in water 4.5 4 .* 



Soluble in neutral ammonium citrate solution 



(reverted phosphoric acid)** 4. 3.5 



In fine* ground bone and tankage 4 . 4 . 



In coarse* bone, tankage and ashes 3.5 3.5 



In cottonseed meal, castor pomace and linseed 



meal 4. 3.5 



Insoluble (in neutral ammonium citrate solu- 

 tion) in mixed fertilizers 2 . 2 . 



Potash. 



As sulfate free from chlorides 5. 9.5 



As muriate (chloride) 4. 8.5 



As carbonate 8 . 11.15 



In cottonseed meal, castor pomace, linseed meal, 



etc 5. 9.5 



In reference to the trade values of potash it should be said that 

 the figures given in this table would not have held throughout the 

 season. They represent the price at which potash salts could have 

 been bought, however, during the months specified. During the 

 season potash salts rose to $250.00 a ton for both sulfate and muriate 

 of potash, making the pound of actual potash cost 25c. During the 

 months of October and November quotations were known to run as 

 high as .S400.00 a ton for muriate in some of the southern states. 

 Of course these prices make the purchase of potash salts for fertilizing 

 purposes prohibitive. 



RAW PRODUCTS AND CHEMICALS. 



Fifty-two samples of ground bone, represented by 

 Ground Bone. 32 analyses have been inspected" during the season. 



The average retail cash price for ground bone has 

 been $33.13 and the average calculated commercial valuation $30.78 

 per ton. Ground bone has averaged 2.97 per cent nitrogen, 74.75 

 per cent of which has been found active by the alkaline permanganate 

 method. Four brands were found deficient in nitrogen and 4 in 

 phosphoric acid. Only 1 brand was found to have a commercial 



♦Fine bone and tankage are separated from coarse bone and tankage by means of a sieve 

 ha\'ing circular openings 1-50 of an inch in diameter. Valuations of bone and tankage are based 

 upon degree of fineness as well as upon composition. 



**Dissolved by a neutral solution of ammonium citrate, sp. gr. 1.09, in accordance with method 

 adopted by the Association of Official Agricultural Chemists. 



