BARLEY 



39 



Total Produce 

 per Acre. 



Mb. 



5000 



4-00O 



-3000 



20OO 



Nitrogen 

 only. 



Nitrogen 



and 



Phosphoric 



Acid. 



Grain per Acre, lb. 



Nitrogen Nitrogen, 



and PhosphoricAcid 



Potash. and 



Potash. 



Straw per Acre, lb. 



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

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



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



