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412 REPORT OF THE CHEMIST OF THE 
How To Make A CommerciaL VALUATION oF A FERTILIZER FROM A 
MANUFACTURER'S GUARANTEE-ANALYSIS. 
The forms of statement used by manufacturers in giving guar- 
anteed analyses differ considerably from one another; they also 
differ from the form of statement adopted by this Station, one 
ally in the following respects : 
(a.) The amount of each ingredient is stated as being between 
two limits varying more or less widely. Thus, in the guaranteed 
analysis of No. 119, ammonia equals three to four per cent. ; 
available phosphoric acid equals ten to twelve per cent. ; insoluble 
phosphoric acid equals one to three per cent. ; potash sa hale two 
to three per cent. In making a valuation Eiht such a form of 
statement of analysis, the lower number is always to be used, since 
the manufacturer is held by law only to the lower guarantee. 
(b) The per cent. of nitrogen in the guarantee-analysis of manu- 
facturers is generally given in the form of ammonia. In these 
fertilizer reports, both forms are given. When, as in most cases, 
the guarantee-analysis states only the amount of ammonia, its 
equivalent of nitrogen is calculated by us and given in the Station 
form of statement, though not given in the manufacturers’ form of 
cuarantee. 
(c) The per cent. of potash is often given in the guarantee- 
analysis in the form of sulphaté or muriate (chloride) of potash. 
In the Station form of statement, the manufacturer’s guarantee is 
always made to give the actual potash. 
In making valuations from guarantee-analyses as given in the 
Station reports, the same rule will be followed as given above, 
but when it is desired to use the manufacturers’ actual statement 
of analysis as a basis for making a valuation, some modifications 
must be made in the foregoing rule. 
1. Nitrogen. 
If the amount of actual nitrogen is given, proceed as above 
under Station analysis. If nitrogen is stated only in form of 
ammonia, then multiply the lower numbers representing the per 
cent. of ammonia by .8235; which will give the per cent. of actual 
nitrogen; and this multiplied by fifteen and one-half cents will 
give the value of ammonia or its equivalent of Teen in ee 
pounds of fertilizer. 
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