Serious Commercial Shortages in Mixed Fertilizers. 



Sixty-nine per cent of the brands analyzed had no deficiencies. This is a better 

 showing than for 1924, when only 58 per cent met their minimum guarantee in all 

 three elements. 



Of 941 guarantees made, about 12 per cent failed in passing, as compared with 

 about 18 per cent for 1924. In comparing the deficiencies by years, as given in the 

 table of "Summary of Low Tests" it should be remembered that the number of 

 brands registered has been materially reduced since 1924. 



Of the total number of brands analyzed, 14 per cent failed to meet the minimum 

 guarantee of nitrogen ; 5 per cent, the minimum guarantee of available phosphoric 

 acid; and 17 per cent, the minimum guarantee of potash. These figures show a 

 decided improvement with reference to nitrogen and available phosphoric acid as 

 compared with 1924, when 26 per cent failed to pass in nitrogen, and 8 per cent 

 in available phosphoric acid. The proportion of potash guarantees that failed 

 in passing was about the same as for the previous season. 



Only about one-half as many brands showed serious commercial shortages for 

 1925 as for the previous season. This may in a measure be a natural sequence 

 following the reduced number of brands registered. 



Mixing Eflficiency. 



Assuming that the station sampling and analysis gives a fair representation of the 

 composition and tonnage of each grade of fertihzer counted, the following table 

 shows the average margin of overruns above the minimum guarantee as provided 

 by each company having four or more brands registered and sampled. The figures 

 are based on the results of sampling and chemical analysis and on the statement of 

 tonnage sold and guarantees made. 



