6 X. II. EXPERIMENT STATION (Bulletin Ml 



CONFORMITY TO GUARANTEE 



Three of the brands w ere deficient in all of the three guar- 

 anteed constituents, nitrogen, available phosphoric arid. 

 and water soluble potash. Nine brands were deficient in 

 two of the three const it ne nts. three in nitrogen and available 

 phosphoric acid, four in uitrogen and potash, and two in 

 available phosphoric acid and potash. 



Twenty-two brands were found to contain less than the 

 guaranteed amount of nitrogen. The greatest deficiency 

 was 0.70 per cent. The average of the other 21 nitrogen 

 deficiencies was 0.17 per cent. 



Eighteen brands failed to meet the guarantee in available 

 phosphoric acid. One brand was deficient 2.6S per cent. 

 The average of the other 17 deficiencies was 0.8!) per cent. 



Fifteen brands contained less potash than the guarantee. 

 The greatest deficiency was 3.17 per cent. The average of 

 the other 14 deficiencies was 1.00 per cent. 



In the tabulation of the analyses in the following pages 

 deficiencies of one-fourth of one per cent or more are shown 

 in bold faced type. The manufacturers are arranged alphar 

 betically. The brand name is listed alphabetically or nu- 

 mericallv bv formula under the manufacturer. 



