16 



passed which show an activity of the water insoluble nitrogen of 80 per cent or 

 better by the neutral method, even though they may have shown a test below 50 

 per cent by the alkaline method. All samples are passed which show the sum of the 

 mineral, water soluble organic, and active water insoluble organic nitrogen equiva- 

 lent to the minimum guarantee. 



In the "Potash" column, "Found," in the tables "Mixtures Showing a Commer- 

 cial Shortage" and "Mixtures Seriously Out of Balance," references to footnotes 

 appear. Many of these refer to the proportion of potash as sulfate and as chloride 

 or muriate. As a usual thing the presence of chlorine in those fertilizers in which the 

 potash is guaranteed as being derived from sulfate is largely traceable to the chlorine 

 found in the sulfate of potash, although other crude stock materials frequently 

 carry an aggregate of .3 per cent of this element. The presence of the chlorine 

 in this class of fertilizers does not, therefore, mean that the manufacturer has 

 actually added muriate of potash, as such, to the mixture. On the other hand, 

 it is reported as muriate of potash for the reason that the presence of the chlorine, 

 whether derived from muriate of potash or other sources, is quite as objectionable 

 in one case as in another if a mixture is desired which is free from chlorine. 



Under "Mixtures Showing a Commercial Shortage of %l or Over per Ton," 

 deficiencies are emphasized by boldface type. 



In those tables headed "Mixtures Substantially Complying with Guarantee" 

 in the column marked "Form of Potash," the word muriate means that enough 

 chlorine was found present to unite with all of the potash (K2O) found, and it 

 is hkely, therefore, that all of the potash was derived from chloride of potash or 

 muriate. 



Figures in parenthesis following the brand name, in tables headed "Mixtures 

 Substantially Comptying with Guarantee," indicate the number of samples from 

 which the composite sample finally analyzed was drawn. 



The simplified method of presenting results of analyses of "Mixtures Substan- 

 tially Complying vnth Guarantee" is followed in this bulletin. The detailed results 

 of analysis of any brand inspected will be gladly furnished to any one sufficiently 

 interested to apply for them. The tables are self-explanatory. 



