INSPECTION OF COMMERCIAL FERTILIZERS 



13 



Deficiency Statistics for Mixed Fertilizers. — Concluded. 



(a) Averages have been recorded for total number of tests or determinations as well as for de- 

 ficiencies wherever several analyses have been made of the same brand. 



Summary of Low Tests in Mixed Fertilizers. 



Serious Connmercial Shortages in Mixed Fertilizers 



Two more brands showed serious commercial shortages this year than in 1928. 



Of the 337 brands analyzed, 221, about 66 per cent, showed no deficiencies. 

 Of the 1,007 guarantees made, 134, or 13.3 per cent, failed to pass, as compared 

 with 15.6 per cent in 1928 and 11.4 per cent in 1927. 



The seriousness of the deficiencies found is indicated by the following statistics : 



Deficiencies not exceeding }4 per cent, 78. 



Deficiencies between }4 and K per cent, 31. 



