Jan., 1929] fertilizer inspection, 1928 5 



PHOSPHORIC ACID DEFICIENCIES 



Three brands of sixteen per cent acid phosphate were 

 analyzed and found to meet the guarantee. One hundred 

 fifteen other brands were guaranteed to contain phos- 

 phoric acid. Twenty-nine of these were deficient in total 

 phosphoric acid and eighteen in available phosphoric acid. 

 Eleven failed to meet the guarantee of total phosphoric 

 acid by less than one-fourth per cent. Thirteen were 

 more than one-fourth per cent below but less than one- 

 half per cent. Four were more than one-half per cent 

 below but less than three-fourths per cent. One was 

 more than three-fourths per cent below but less than one 

 per cent. Seven failed to meet the guarantee in available 

 phosphoric acid by less than one-fourth per cent. Three 

 were more than one-fourth per cent below but less than 

 one-half per cent. Six were more than one-half per cent 

 below but less than three-fourths per cent. Two were 

 more than one per cent below. 



POTASH DEFICIENCIES 



One sample of muriate of potash was analyzed and 

 found to meet the guarantee. One hundred six other 

 brands were guaranteed to contain potash in amounts 

 varying from 2.00 per cent to 14.00 per cent. Eighteen of 

 these failed to meet the guarantee. Ten were deficient by 

 less than one-fourth per cent. Five were deficient by 

 more than one-fourth per cent but less than one-half per 

 cent. Two were deficient by more than one-half per cent 

 but less than three-fourths per cent and one was deficient 

 by more than three-fourths per cent but less than one 

 per cent. 



In the tabulation of the analyses in the following 

 pages deficiencies of two-tenths of one per cent or more 

 are shown in Italics. The names of the manufacturers 

 are arranged alphabetically, and under the manufacturer 

 the different brands are arranged alphabetically or 

 numericallv by formula. 



