34 



HOGS FIELD 



Total Produce 

 per Acre. 



Plot 10 



Unmanured 



-♦0. 



Minerals 



only. 



ler Ac 



4A. 



Minerals 



+43 lb.N. 



as Ammonia. 



lb. 



4 N. 



Minerals 



+ 43lb.N. 



as Nitrate. 



St 



4.C. 7-2 



Minerals Farmyard 



+49lb. N. Manure 

 as Rape Cake. 



rAc 



raw per Acre 



Fig. 11. — Yield in Barley (Grain and Straw) with different sources of Nitrogen. 

 Averages for 51 years (1852-1902). 



The figures in the labels indicate bushels of Grain and cwt. of Straw. 



