INSPECTION OF COMMERCIAL FERTILIZERS 13 



Mixing Efficiency Table. 



Of the 22 manufacturers listed in this table, all but 4 had an overrun in all 

 three elements of plant food. One manufacturer failed to show an average 

 sufficient to meet the guarantees in either nitrogen or potash. Although only 

 one manufacturer failed to supply enough nitrogen to meet the guarantees, three 

 others showed average overruns of less than .1 per cent. In available phosj^horic 

 acid satisfactory overruns were noted in all but one instance. Three manufac- 

 turers failed to supply a sufficient amount of potash to meet the average guar- 

 antee. All of the other manufacturers showed overruns in excess of .1 per cent 



Explanation of Tables of Analyses. 



Guarantee. This column gives the manufacturer's claim or guarantee for 

 the three elements of plant food, nitrogen, available phosphoric acid and potash, 

 in the order stated. When the nitrogen system is finally adopted by all of the 

 manufacturers, the guarantee of a fertilizer will be the same as the grade. 



With few exceptions, wherever the grade of a fertilizer is used as a part of the 

 trade name the order and form express ammonia, available phosi)horic acid and 

 potash. One of the exceptions noted is the Eastern States Farmers' Exchange. 

 Their grade expression refers to nitrogen, available phosphoric acid and potash, con- 

 forming to the recommendations of both the National Fertilizer Association and 

 the Committee on Definition of Terms and Interpretation of Results on Fertilizers. 



Commercial Shortages. In the table designated "Mixtures showing a com- 

 mercial shortage of %l or more per ton," the column headed "Approximate com- 

 mercial valuation per ton" gives the sum of the valuation of each plant food 

 element computed from the analysis by use of the trade values adopted by the 

 Massachusetts Fertilizer Control for 1980, which appear on a preceding page of 

 the bulletin. 



Under the heading "Approximate commercial shortage per ton" is shown the 

 commercial valuation of the deficiencies or tests found below the guarantee after 

 allowance is made for the value of overruns or tests above the guarantee. 



Deficiencies are emphasized by boldface type. 



