15 



Mixing Efficiency Table — Concluded. 



Manufacturer. 



Average Percentage of Plant 



Food above or below the Minimum 



Guarantee. 



Nitrogen. 



Available 



Phosphoric 



Acid. 



Potash. 



International Agricultural Corp. 



Lowell Fertilizer Co. 



The Mapes Formula and Peruvian Guano Co. 



Sylvester A. McGovern 



Mitchell Fertilizer Co 



The National Fertilizer Co 



New England Fertilizer Co. . . . . 



Olds & Whipple, Inc 



Oyama Products Co. . . . . . 



Parmenter & PoLsey Fertilizer Co. . 

 Providence Farmers Exchange Inc. . 



The Rogers & Hubbard Co 



Ross Bros. Co. ...... 



F. S. Royster Guano Co 



Sanderson Fertilizer and Chemical Co. . 



M. L. Shoemaker & Co., Inc 



Springfield Rendering Co. . . . . 



Talfa Co 



William Thomson & Sons Ltd. 



20th Century Specialty Co. . . . . 



Virginia-Carolina Chemical Co. 



C. P. Washburn Co 



What Cheer Chemical Co., Inc. 

 Whitman & Pratt Rendering Co. 



The Wilcox Fertilizer Co 



A. H. Wood & Co 



Worcester County Farmers Exchange, Inc. 

 Worcester Rendering Co. . . . . , 



+ .08 

 + .07 

 + .28 



+1.90 

 — .09 

 + .31 

 + .16 

 + .14 

 + .60 

 + .09 

 + .01 

 + .16 

 + .09 

 + .03 

 + .15 

 + .15 

 + .03 

 + .15 

 + .71 



+2.24 

 + .24 

 + .41 

 + .03 

 + .11 

 + .30 

 + .26 

 + .11 

 + .02 



+ .32 

 + .24 



— .13 

 +4.201 



+ .05 

 + .33 

 + .10 

 +1.50 

 —1.43 

 + .14 

 + .43 

 + .51 



— .38 



— .11 

 + .32 

 + .16 

 + .09 



+1.191 

 + .70 



+4.14 

 + .66 



— .40 

 + .06 

 + .41 

 + .31 

 + .17 

 + .19 

 + .34 



1 Total phosphoric acid. 



The above table shows that, of the 51 manufacturers, — 



30 showed an overrun in all of the elements guaranteed. 



46 showed an overrun and 5 a shortage in nitrogen. 



38 showed an overrun and 13 a shortage in available phosphoric acid. 



40 showed an overrun and 8 a shortage in potash. 



6 showed a shortage in two of the elements of plant food. 



Certain data given in the preceding table should prove a danger signal to those 

 manufacturers whose average margin of overruns is very low or of a minus quantit3^ 

 They furnish largely the cases for rebates and prosecutions. Consistently large over- 

 runs, on the other hand, show a manufacturer to be at a serious disadvantage with 

 his more efficient competitors whose margin of overruns is safe but not excessive. 



