2S6 GROUND RAPE-CAKE. 



More than in manure ... 53 less 7 less 279 



The manure poorest in nitrogen (the bone-dust) 

 thus actually gave the highest, and the one richest in 

 nitrogen (the rape-cake) the lowest, amount of that 

 element in the produce. 



To 100 lbs. nitrogen in the manure, there Avas obtained 

 of that element in the increased produce — 



By bone-dust 125 lbs. 



„ guano 97 „ 



„ rape cake . . . . . . 32 ,, 



The amount of phosphoric acid in the crops was 

 from — 



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