672 ANNUAL REPORT OF THE Off. Doc. 



COMPARISON OF SELLING PRICE AND VALUATION, 1906-1911— Continued 



u 



> 

 o 



a 

 o 



as 

 3 • 



— a 



•75 o 



>t; 



CA 





Ground bone: 



1905, Spring, 

 Fall, -. 



1906, Spring," 

 Fall, -. 



1907, Spring, 

 Fall, -. 



1908, Spring, 

 Fall, -. 



1909, Spring. 

 Fall, _ 



1910, Spring, 

 Fall, . 



1911, Spring. 

 Fall, . 



— 2..S6 

 1.00 



— .79 

 1.32 



—1.91 



— .12 



— .08 

 —1.28 



— .42 



— .68 

 .08 



1.12 

 .54 

 .01 



FEKTILIZER ANALYSES AUGUST 1 TO DECEMBER 31, 1911 



Since August 1, 1911, there have been received from authorized 

 sampling agents twelve hundred and eighty fertilizer samples, of 

 which four hundred and ninety-eight were subject to analysis. Pref- 

 erence is given to those which have not been recently analyzed. In 

 cases where two or more samples representing the same brand were 

 received, equal portions from several samples were united, and the 

 composite sample was subjected to analysis. 



The samples analyzed group themselves as follows: 293 complete 

 fertilizers, furnishing phosphoric acid, potash and nitrogen; 3 dis- 

 solved bones, furnishing phosphoric acid and nitrogen; 129 rock and- 

 potash fertilizers, furnishing phosphoric acid and potash; 42 acidu- 

 lated rock phosphates, furnishing phosphoric acid only; 25 ground 

 bones, furnishing phosphoric acid and nitrogen, aAd '7 micella- 

 neons samples, which group includes substances not properly classi- 

 fied under the foregoing heads. 



The determinations to which a complete fertilizer is subjected are 

 as follows: (1) Moisture, useful for the comparison of analyses, for 

 indication of dry condition and fitness for drilling, and also of the 

 conditions under which the fertilizer was kept in the warehouse. (2) 

 Phosphoric acid — total and insoluble; that is, that portion not soluble 

 in water nor in warm ammonium citrate solution (a solution supposed 

 to represent the action of plant roots upon the fertilizer), which is 

 assumed to have little immediate food value. By difference, it is 

 easy to compute the so-called "available" phosphoric acid. (3) Potash 



