November, 1920] fertilizer inspection, 1920. 9 



AMMONIATED PHOSPHATES. 



Six samples of ammoniated phosphates analyzed varied 

 from 1.64 to 5.80 per cent of nitrogen and from 10.10 to 

 14.83 per cent of available phosphoric acid. The average 

 price of these brands was $59 per ton. By subtracting the 

 average cost of phosphoric acid upon the basis of $1.72 per 

 unit as found in the acidulated phosphates from the average 

 total cost of the ammoniated phosphates and dividing this 

 by the average per cent of nitrogen we find that the nitro- 

 gen in the acidulated fertilizer cost about $12.33 per unit. 

 This is very high compared with the cost of $5.56 per unit 

 in sodium nitrate and $6.90 in ammonium sulphate. 



Four samples of sheep manure were analyzed with guar- 

 antees ranging from 1.80 to 1.85 per cent of nitrogen, 1.20 

 to 1.50 per cent of phosphoric acid and from 1.00 to 3.00 

 per cent of potash. The average price of these sheep 

 manures was $63.75 per ton. Figuring their value upon 

 the basis of the cost of phosphoric acid in acid phosphate 

 of $1.72 per unit, potash in muriate of potash as $3.70 per 

 unit, and nitrogen in ammoniated phosphates at $12.33 

 per unit, we find the average value of these sheep manures 

 to be $32.39 per ton. Their cost was just about twice their 

 commercial value. 



DEFICIENCIES IN ANALYSIS. 



Out of the 100 samples analyzed 22 or 22 per cent showed 

 a deficiency of 0.2 of a per cent or more in one or more of 

 the plant foods, nitrogen, phosphoric acid and potash. 

 Some of these deficiencies were as much as 0.5 of a per cent 

 or more. This indicates a serious loss to the farmer using 

 the brands which showed these deficiencies. 



ANALYSIS OF BRANDS. 



The following table shows the detailed results of the 

 analysis of the different brands. In the table the names 

 of the manufacturers are arranged alphabetically and un- 

 der the names of each manufacturer the different brands 

 are arranged alphabetically. 



