lO N. H. AGR. EXPERIMENT STATION [Bulletin 201 



The 7vide range of prices sliozv the necessity of selecting 

 your fertilisers so that you obtain the most plant food for 

 the dollar. Table I emphasizes this point also. 



ACIDULATED PHOSPHATES. 



Five brands of acid phosphates were analyzed which 

 showed from i6 per cent to 16.75 P^"" cent available phos- 

 phoric acid averaging 16.49 P^^ cent available phosphoric 

 acid. The price ranged from $28.00 to $42.00 per ton. The 

 wide range in prices here suggests again the need for care 

 in buying fertilizers. 



SHEEP MANURES. 



Six brands of sheep manure were analyzed which aver- 

 aged 1.72 per cent nitrogen. 1.07 per cent phosphoric acid 

 and 2.01 per cent potash. The price ranged from $55.00 

 to $64.00 per ton, averaging $59.82. Figuring their value 

 upon the basis of the cost of phosphoric acid in acid phos- 

 phate of $1.75 per unit, potash in muriate of potash as 

 $2.45 per unit, and nitrogen in tankage at $8.13 per unit, 

 we find the average value of these sheep manures to be 

 $20.53 per ton. Their cost was just about three times their 

 commercial value. 



DEFICIENCIES IN ANALYSIS. 



Forty-three brands out of the 104 samples analyzed, or 

 41.3 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 1920 twenty-two^ per cent of the samples 

 showed deficiencies. 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 

 analyses of the different brands. In the table the names 

 of the manufacturers are arranged alphabetically and under 

 the name of each manufacturer the difl:erent brands are ar- 

 ranged alphabetically. 



