INSPECTION OF COMMERCIAL FERTILIZERS 



13 



Summary of Deficiencies in Mixed Fertilizers. 



1929. 



1930. 



1931. 



Brands deficient in one element . 

 Brands deficient in two elements . 

 Brands deficient in three elements 

 Brands deficient in nitrogen .... 

 Brands deficient in available phosphoric acid 

 Brands deficient in potash .... 



99 

 18 

 

 43 

 51 

 40 



94 

 14 

 1 

 38 

 46 

 41 



99 

 15 

 

 23 

 67 

 49 



Serious Commercial Shortages in Mixed Fertilizers. 



Of the 332 brands analyzed, 218, or 65.7 per cent, showed no deficiencies. 

 Out of 990 plant food guarantees made, 87 per cent were fully maintained. 

 The deficiency table shows the following statistics: 



Deficiencies not exceeding H of 1 per cent, 69. 



Deficiencies between J^ and K of 1 per cent, 34. 



Deficiencies between 3^ and % of 1 per cent, 14. 



Deficiencies more than % oi 1 per cent, 13. 



Based upon the total number of guarantees of each element made, 7 per cent 

 of the nitrogen guarantees, 17.3 per cent of the available phosphoric acid 

 guarantees, and 15.1 per cent of the potash guarantees were not met. 



Seventeen of the 23 nitrogen deficiencies, 18 of the 57 available phosphoric 

 acid deficiencies, and 34 of the 49 potash deficiencies did not exceed 3<C of 1 

 per cent. 



There were 15 less shortages in nitrogen, 11 more in available phosphoric 

 acid, and 8 more in potash, than in 1930. 



Mixing Efficiency Table. 



Manufacturer. 



American Agricultural Chemical Co. 

 Apothecaries Hall Co. 

 Armour Fertilizer Works 

 Berkshire Chemical Co. . 

 Central Chemical Co., Inc. 

 Eastern States Farmers' Exchange 



Essex Fertilizer Co 



International Agricultural Corp. . 



Henry James & Son, Inc., Springfield 



Lowell Fertilizer Co. 



New England Fertilizer Co. . 



Old Deerfield Fertilizer Co., Inc. . 



Olds & Whipple, Inc. 



Parmenter & Polsey Fertilizer Co.. 



Piedmont-Mt. Airy Guano Co., Inc. 



Rogers & Hubbard Co. . 



Springfield Rendering Co. 



Standard Wholesale Phosphate & Acid Works 



Inc 



Virginia-Carolina Chemical Corp. . 

 Worcester Rendering Co. 



Average Percentage of Plant Food Above or 

 Below the Minimum Guarantee. 



Nitrogen. 



+ .19 

 + .34 

 + .40 

 + .42 

 + .13 

 + .95 

 + .22 

 + .20 

 12 

 21 

 + .21 

 + .57 

 + .37 

 + .37 

 09 

 29 

 + .29 



+ 



+ 



+ .07 

 — .02 

 + .15 



Available 

 Phosphoric Acid. 



+ 



+ .38 

 +1.29 



+ .46 



+ .37 



+ .30 



— .10 

 + .27 

 + .10 

 + .20 



72 

 06 



+ .29 



+ .60 



+ .18 



— .64 

 + .49 

 + .16 



+ .28 



+ .15 



+ .39 



Potash. 



+ .14 

 +1.39 



+ .33 



+ .66 



+ .58 



+ .007 



+ .12 



+ .32 



— .13 

 + .29 

 + .20 

 + .39 

 + .69 

 + .14 

 + .26 

 + .25 

 + .31 



— .03 



— .002 

 + .80 



