BARLEY 



Total Produce 

 per Acre. 



5000 



4000 



3000 



Nitrogen 

 only. 



Nitrogen 



and 



Phosphoric 



Acid. 



Nitrogen 



and 



Potash, 



Nitrogen, 

 PhosphoricAcid 

 and 

 Potash. 



Grain per Acre, lb. 



Straw per Acre, lb. 



Fig. 12.— Effect of Mineral Manures on the yield of Barley (Grain and Straw). 

 Mean of Series A. N. and C. 51 years (1852-1902). 

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



