■Plan of the Plots in Agdell Field on which Experiments have been made on 

 Four-Course Rotation. 



1848 and onwards. 



C. Complete Manure for Root Crops. 

 As " M," and 

 200 lb. Ammonium-salts, and 

 2000 lb. Rape Cake 

 per acre. 



M. Minerals only for Root Crops, 

 500 lb. Superphosphate, 

 500 lb. Sulphate of Potash, 

 100 lb. Sulphate of Soda, 

 200 lb. Sulphate of Magnesia, 

 per acre. 



O. 



Unmanured. 



Total area of ploughed land, about 3 acres. Area of each of the 6 divisions, | acre. 



The 2 lower divisions, Unmanured continuously (Plots 5 and 6). 



The 2 middle divisions, Mineral Manure, for the Roots, each Course (Plots 3 and 4). 



The 2 upper divi'<ions. Mineral and Nitrogenous Manure, for the Roots, each Course 



(Plots 1 and 2). 

 The 3 left-hand divisions. Clover (or Beans), 3rd year each Course. 

 The 3 right-hand divisions. Fallow, 3rd year each Course. 



The double lines indicate division paths between plot and plot 



