Ill 



RED CLOVER grown year after year on rich Garden Soil, 

 Rothamsted Garden. 



Hay, Dry Matter, and Nitrogen per Acre, 1923 and 1924. 



WHEAT AFTER FALLOW (without Manure 1851, 



and since). 



Hoos Field, 1923 and 1924. 





AVERAGE WHEAT YIELDS of VARIOUS COUNTRIES. 



Note. 



-Figures for Great Britain, England and Hertfordshire are taken from the Board of 

 Agriculture's "Agricultural Statistics," Vol. 46. Other figures from "Annuarie 

 International de Statistique Agricole," 1910-12, and converted at the rate of 60 lb. 

 per bushel. 



