AVITII VAlMors XITIvMXJKNors MAM IM- 



not (juile so effective as tlie more active tonus of niiro^'tMi. 

 giving over the whole period an average yield of 41 ai^'aiust 

 48'5 and 4*2"1 l)ushels of i;rain. Tliis small dericicncv has 

 not diminished in the later years, which seems tu indiciite 



6000 lb. 



Grain per Acre 



lb. 



Straw per Acre, lb 



1 u;. 11.— Yield of Barley (Grain and Straw) with different sounes 



of Nitrogen. Averages for .".1 years, 18:.-J-190'J. 



The figures in the labels indicate bushels of grain and cwt. of straw 



that the nitrogen compounds of rape cake are almost wholly 

 utihsable by the crop to which they are applied. At any ratr. 

 no large amount of residue slowly becoming availal)le is left 

 in the soil, as in the case of faiinyard manure. 



The plot receiving farmyard manure, 7-'J, ^Mves a higher 

 crop than any other, but the amount of nitro.^en suppli.d in 



