November, 1924] fertilizer inspection, 1924 11 



acid. The price ranged from $20.00 to $34.00 per ton. 

 This wide range of prices again emphasizes the need of 

 buying according to the cost of the plant food. 



SHEEP MANURE TOO EXPENSIVE. 



Six brands of sheep manures were analyzed which 

 averaged 1-46 per cent of nitrogen, 1.53 per cent of total 

 phosphoric acid and 2.38 per cent of potash. The price 

 ranged from $45.00 to $70.00 per ton averaging $55.00. 

 Figuring their value on the basis of the cost of phosphoric 

 acid at $1.64 per unit, potash at $0.86 per unit and nitro- 

 gen at $5.28 per unit we find the average value of these 

 sheep manures to be $12.27 per ton. Their cost was more 

 than four times their commercial value. 



DEFICIENCIES IN ANALYSIS. 



Twenty- four brands out of 115 analyzed or 21.0 per 

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

 more of the plant foods, nitrogen, phosphoric acid and 

 potash. In 1923, 21.0 per cent of the samples showed defi- 

 ciencies. 



Table No. 4 shows the number of brands analyzed 

 from each manufacturer and the number which met and 

 failed to meet the guarantee. Study this table and buy 

 from manufacturers who maintained their guarantee. 



