27 



Special Onion Grower. No. 1207. Nitrogen found 3.68%^. 

 guaranteed 4.10%, available phosphoric acid found 0.54%, guaran- 

 teed 6.00%, potash found 3.00%, guaranteed 3.00% 



Reading Bone Fertilizer Co., Gilt Edge Potato and Tobacco 

 Grower. Nos. 1154-1202. Nitrogen found 1.64%, guaranteed 

 1.64%, available phosphoric acid found 12.10%, guaranteed 12.00%, 

 potash found 3.38%, guaranteed 4.00%. 



Rogers & Hubbard Co., Complete Phosphate. Nos. 405-461- 

 725-763-1087. Nitrogen found 1.44%, guaranteed 1.50%, avail- 

 able phosphoric acid found 6.22%, guaranteed 7.00%, potash found 

 1.67%, guaranteed 1.66%. 



F. S. Royster Guano Co., Tomahawk Compound. No. 1103. 

 Nitrogen found 2.14P/o, guaranteed 4.11%; available phosphoric 

 acid found 4.46%, guaranteed 4.00%: potash found 2.77%, guaran- 

 teed 3.00%. 



Another sample of this brand forwarded by the company' at 

 our request and said to be from the same lot as No. 1163 tested over 

 the guarantee in commercial value to the amount of 14 cents per ton. 



Virginia-Carolina Chemical Co., National Corn, Grain and Grass 

 Top Dressing. No. 579. Nitrogen found 2.91%, guaranteed 3.29% , 

 available phosphoric acid found 9.41%, guaranteed 8.00%, potash 

 found 3.70%, guaranteed 4.00%. 



QUALITY OF PLANT FOOD. 



Nitrogen is the most expensive element of plant food 



Character of the farmer has to purchase, costing under normal 



Nitrogen. conditions three to four times more than either 



phosphoric acid or potash. During the past season 

 the farmer has had to pay for his organic nitrogen, in the various 

 grades of mixed commercial fertilizers, 39.5 cents, 28.9 cents and 26.8 

 cents per pound, these figures representing the cost in low, medium 

 and high grade goods, respectively. Under these conditions it does 

 not seem unreasonable for him to expect that "the nitrogen shall be 

 derived from high grade sources and show a satisfactory availability 

 or activity. Moreover, the fertilizer manufacturer is required by 

 our state law to truly state, by label, any inert material which is used 

 in a fertilizer to supply any part of the nitrogen. To quote from the 

 law (section 1, paragraph 5) : "If any part of the nitrogen contained 

 in the fertilizer is derived from pulverized leather, raw, roasted, or 

 steamed, or from untreated hair, wool waste, peat, garbage tankage, 

 or from any inert material whatsoever, the label shall truly state the 

 specific material or materials from which such part of the nitrogen 

 is derived." 



