WHEAT 



31 



Total Produce 

 per Acre 



7000 lb. - 



6000 



SOOO 



4000 



200O 



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 (1852-19u2). 



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



