90 HATCH EXPERIMENT STATION. [Jan. 



daring the six months preceding March, 1903, and refers to 

 the current market prices of the leading standard raw mate- 

 rials which furnish nitrogen, phosphoric acid and potash, and 

 which enter largely into the manufacture of our commercial 

 fertilizers. 



Table A, following, gives the average analysis of oiBcially 

 collected fertilizers for 1903 ; Table B gives a compilation of 

 analyses, showing the maximum, minimum and average per- 

 centages of the different essential elements of plant food in 

 so-called special crop fertilizers put out by different manu- 

 facturers. 



