14 CONTROL SERIES No. 65 



"Number of samples" indicates the number of samples included in the 

 composite which was analyzed. 



Inferior Nitrogen. The presence of inferior forms of organic nitrogen is 

 indicated by footnotes. | 



Potash Forms. Wherever tests for chlorine showed a sufficient amount % 

 present to unite with all of the potash found, the source of the potash is des- \ 

 ignated as muriate. Wherever insufficient chlorine was found to account for ij 

 all of the potash it is evident that forms of potash other than muriate were 

 used. In such cases, the figures under the sub-heading "As muriate" do not j 

 imply necessarily that muriate of potash was actually added to the mixture, 

 but that chlorine was present, probably from impurities in the fertilizer 

 chemicals, in amounts to account for the percentage of potash indicated. 

 The balance of the potash found is listed under the sub-heading "In forms 

 other than muriate" and may be derived from sulfate, nitrate, or carbonate, 

 as the case mayjbe. ; 



