^ CONTROL SERIES NO. 170 



EXPLANATION OF TABLE OF ANALYSES 



Guarantee. The plant food guarantee or the grade of each fertilizer .3 made 

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

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

 in that order. ^ 



Mixtures Substantially Complying with the Guarantee. In addition to 

 those fertdizers that meet their guarantees in every respect, this table includes also 

 a list of those mixtures that have one or more elements below the guaranteed per- 

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



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 some brands, since this information is of value to tobacco 

 growers and other users of fertilizers containing a high percentage of this form of 

 nitrogen. 



,, ^r^"!" ^"""'- '^^'*' ^°' '^^'"""^^ ^-^e "lade only on tobacco mixtures and on 

 ^ose fertilizers that carry a guarantee of potash in forms other than muriate. 

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

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



Mixtures Showing a Commercial Shortage of «?1 or More per Ton 



Manufacturer 

 and Brand 



American Agricultural Chemical 

 Co. 



AA Quality 8-12-12. . . 

 Agrico Phosphate & Potash 

 0-15-30 



Armour Fertilizer Works 



Armour's Big Crop 0-20-20 

 Armour's Big Crop 10-10-10. 



Consolidated Rendering Co. 



Corenco 8-16-16 (a) 



Davison Chemical Co. 



8-16-16 Davco Granulated. . . 



Sears, Roebuck <S Co. 



Cross Country Plant Food 

 5-10-5 



Nitrogen Found 



Water 

 Insoluble 

 Organic 



Total 



9.06 



6.97 



4.03 



Available 



Phosphoric 



Acid 



Found 



12.00 

 15.00 



19.51 

 9.80 



15.47 



16.15 



10.05 



a See table of "Mixtures sub.<!tantially complying with cuarantees. 



Water 

 Soluble 

 Potash 

 (K.O) 

 Found 



12.00 

 28.80 



18.60 

 10.80 



15.70 

 16.00 



5.70 



Approximate 



Commercial 



Shortage 



per Ton 



$1.32 

 1.24 



2.64 

 2.75 



1.41 

 2.80 



2.09 



