4 N. II. ACK. k.\i>i;kimi:nt station [Bulletin 329 



In Table I are tabulated the grades of complete fer- 

 tilizers analyzed in this year's inspection, the number of 

 brands sampled by the inspector in each grade, the av- 

 erage per cent of nitrogen, of available phosphoric acid, 

 and of water soluble potash and the average retail price 

 per ton. 



CONFORMITY TO GUARANTEE 



Seventy-four of the 116 brands analyzed equalled or 

 exceeded the manufacturer's guarantee. One brand was 

 below the guarantee in each of the three constituents, 

 total nitrogen, available phosphoric acid and water sol- 

 uble potash. Eight brands were below guarantee in two 

 of the three constituents, six in nitrogen and available 

 phosphoric acid, one in nitrogen and total phosphoric 

 acid, and one in nitrogen and potash. Thirty-three brands 

 failed to meet the guarantee in only one constituent. 



Including all the brands referred to above, 15 brands 

 were found to contain less than the guaranteed amount 

 of nitrogen. The greatest deficiency was 0.60 per cent. 

 The average of the other 14 deficiencies was 0.17 per 

 cent. Twenty-nine brands failed to meet the guarantee 

 in available phosphoric acid. One brand was deficient 

 1.25 per cent. The average of the other 29 deficiencies 

 was 0.42 per cent. Six brands contained less potash than 

 was guaranteed. The greatest deficiency was 1.79 per 

 cent. The average of the other 5 deficiencies was 0.48 

 per cent. 



Thirteen brands were guaranteed to contain magnesium 

 oxide. All fully met the guarantee. 



In the tabulation of the analyses in the following pages 

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

 shown in bold face type. The manufacturers are arranged 

 alphabetically. The brand name is listed alphabetically 

 or numerically by formula under the manufacturer 



