EFFECT OF NITROGENOUS MANURES 



43 



is considerable, and much superior to that grown by minerals 

 without nitrogen. Being a deep-rooted plant and possessing a 

 comparatively long period of growth, wheat is well able to 



600O 



5000 



AOOO 



Plots 



Grain per Acrejb. * 



Straw per Acre, lb. 



FIG. 3. 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. 



