86 



EXPERIMENT STATION. 



[Jan. 



A pound of total phosphoric acid in " Thomas slag phosphate ' 

 has cost the consumer on the average about 5 cents. 



Summary of Analyses of Complete Fertilizers, 1907. 



The table below shows the comparative quality of the brands 

 of complete fertilizer analyzed during the year, and gives the 

 following information concerning each manufactm'er : («) the 

 number of brands of complete fertilizer collected and anal^^zed ; 

 (6) the number of brands in which all three of the essential 

 ingredients of plant food are equal to the lowest guaranty ; 

 (c) the number which do not show a commerciar shortage, in- 

 cluding those fertilizers where a deficiency of any one element 

 is offset commercially by an (>xcess of some of the other essen- 

 tial ingredients ; {(I) the per cent, of the whole number of 

 complete fertilizers sold by each company not having a com- 

 mercial shortage. The last three colunms indicate the number 

 of brands deficient in one, two and in all tln-ee of the essential 

 elements of plant food. 



