33 



nitrogen in mixed fertilizers. Satisfactory results were obtained 

 with the Jones' modification, which were confirmed on- the same 

 samples by means of vegetation experiments conducted at the 

 Rhode Island Experiment Station. The work proved so satisfac- 

 tory that in March, 1911, the Jones' modification was adopted 

 provisionally by the New England, New York and New Jersey Ex- 

 periment Stations. 



All of the complete fertilizers reported in this btdletin have, 

 therefore, been tested as to their organic nitrogen activity. In 

 the tables of analysis will be found columns headed "Active Organ- 

 ic Nitrogen" and "Inactive Organic Nitrogen." This form of ex- 

 pression is somewhat abbreviated as compared with the form used 

 by some of the other Experiment Stations. There are two reasons 

 for this: 1st, lack of space due to publication of "Retail Cash 

 Prices" and "Percentage of Difference," and 2d, the belief that 

 the above form would be more clearly understood by the average 

 consumer. By "Active Organic Nitrogen" is meant that portion 

 which will probably be available during the first season of its appli- 

 cation. The "Inactive Organic Nitrogen," as its name indicates, 

 will probably not be available as plant food the first season of its 

 application, altho it may in time become active. There is not suf- 

 ficient data at hand to give this form of nitrogen a definite value 

 either agriculturally or commercially. In calculating the com- 

 mercial value of the organic nitrogen in mixed fertilizers we have, 

 therefore, as in past years assumed that it was derived wholly from 

 high grade sources. This will give those fertilizers found contain- 

 ing low grade organic ammoniates a rather too high valuation. 



Those brands having less than 50 per cent of their water insoluble 

 organic nitrogen active or available have been designated in the 

 tables by a cross placed within a circle © at the right above the 

 figures in the column headed "Inactive Organic Nitrogen." 

 Wherever the circle is used it indicates that low grade nitrogen- 

 containing organic matter has been used as a part of the total or- 

 ganic nitrogen in the fertilizer. 



A good many brands have come near to the danger mark. The 

 following have fallen below the 50 per cent standard, some more 

 than others : 



Armour Fertilizer Works, Baltimore, Baltimore Pulverizing Co., Baltimore, 

 Md. Md. 



Fish and Potash, 9^''^^^^^ Brand, 



17 -i J T. i r^ cj -1 Market Garden, 



rruit and Root Crop Special, 



Grain Grower. Berkshire Fertilizer Co., Bridgeport, 



Comi. 

 Atlantic FertiUzer Co., Baltimore, Md. Complete Fertilizer, 

 Grain Fertilizer. Ammoniated Bone Phosphate. 



