19 



Cents per pound. 



Nitrogen. 1910. 1911. 



In ammonia salts 16 16 



In nitrates 16 16 



Organic nitrogen in drv and fine ground fish, meat 



and blood " 20 23 



Organic nitrogen in fine* bone, tankage and mixed 



fertilizers 20 20 



Organic nitrogen in coarse* bone and tankage 15 15 



Organic nitrogen in cottonseed meal, castor pomace, 



linseed meal, etc., — 21 



Phosphoric Acid. 



Soluble in water 43^ 43^ 



Soluble in neutral ammonium citrate solution (re- 

 verted phosphoric acid) ** 4 4 



In fine* ground bone and tankage 4 4 



In coarse* bone, tankage and ashes 33^ 33^ 



In cottonseed meal, linseed meal and castor pomace .33^ 4 

 Insoluble (in neutral ammonium citrate solution) in 



mixed fertilizers 2 2 



Potash . 



As sulfate, free from chlorides 5 5 



As muriate (chloride) 434 ^}4: 



As carbonate 8 8 



In cottonseed meal, castor pomace, linseed meal, etc. — 5 



The basis for these trade values was the average wholesale 

 quotations of chemicals and raw materials as taken from the com- 

 mercial publications during the six months preceding March 1, 

 1911, plus about 20 per cent. They are supposed to represent the 

 average cost per pound for cash at retail of nitrogen, phosphoric 

 acid and potash as found in unmixed fertilizing material in the 

 principal markets in New England and New York. There has 

 been but little change in the cost of the various forms of plant 

 food, with the exception of the better forms of organic nitrogen 

 which have shown a considerable advance as compared with the 

 previous year. 



In connection with the valuations which are published in the 

 tables of analysis there will be found the average retail cash price 

 and percentage of difference. The usual care has been exercised in 



*Fine and medium bone and tankage are separated by a sieve having circular openings 

 1-50 of an inch in diameter. Valuations of these materials 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 Association of Official Agricultural Chemists. 



