8 CONTROL SERIES NO. 126 



Our calculated guaranteed value: 



Water-insoluble nitrogen = .88 + .11 = .99 x|$8.00 = $7.92 



Water-soluble nitrogen ......= 5.00 - .99 = 4.01 X $2.00 = 8.02 



Available phosphoric acid = 8.00 X $1.40 = 11.20 



Potash = 7.00 x|$0.80 = 5.60 



Total $32.74 



Approximate commercial shortage = (39.0C -h 32.74) X 1.46 = $1.74 per ton. 



Explanation of Table of Analyses 



Gucirantee. The plant food guarantee or the grade of each fertilizer is made 

 a part of the trade name under the heading "Name of Manufacturer and Brand", 

 and is expressed as nitrogen, available phosphoric acid, and water soluble potash 

 and in that order. 



Mixtures Substantially Complying with the Guarantee. In addition to those 

 fertilizers which meet their guarantees in every respect, this table includes also 

 those mixtures which have one or more elements below the guaranteed percentage 

 but have a shortage of less than $1 per ton. 



From the Control Official's viewpoint, the amount of overrun, within reason- 

 able limits, found in any sample of fertilizer is not especially significant. Of 

 main importance is the fact that the particular sample analyzed shows that the 

 manufacturer of the brand represented by the sample is selling a product which 

 is or is not substantially as guaranteed. The manufacturer whose 4-9-7 brand 

 is found by the Control Official to be running 4.01-9.03-7.02 in every sample of 

 the brand tested is meeting all requirements covering this part of the fertilizer 

 control laws as fully as the manufacturer of another 4-9-7 brand found to run 

 4.85-9.95-7.90 in each sample tested. 



Therefore this table, in addition to the data mentioned in the next paragraph, 

 contains only results of analytical tests pertaining to the average amount of 

 water insoluble nitrogen present in each brand, since this information is of value 

 to tobacco growers and other users of fertilizers containing a high percentage of 

 this form of nitrogen. 



Potash Forms. Tests for chlorine are made only on tobacco mixtures and on 

 those fertilizers which carry a guarantee of potash in forms other than muriate. 

 When the amount of chlorine present in any brand exceeds the tolerance allowed 

 for that brand, this fact is indicated by a footnote. 



