28 



BROADBALK FIELD 



Total Produce 

 per Acre 



7000 lb. - 



6000 



500O 



4000 



3000 



2000 



Plots 3 8c4- 



Grain per Acre, lb. 



Straw per Acre, lb 



Fig. 8.— Broadbalk Wheat. Effect of increasing amounts of Nitrogen on the production 



of Wheat (Grain and Straw). Average, 51 years (1852-1902). 



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



