IMPORTANCE OF PIK )S1MI()1M( ' ACID m 

 acid, in tlie ear long before Plots :) and (to a less extent) 



Nitrogen Nitrogen 



only. and 



Phosphoric 



Acid. 



^ 



Grain per Acre Jb. 



Nitrogen Nitrogen, 



and Phosphoric Acid 



Potash. and 



Potash. 



Straw per Acre, lb. 



Vh;. 1:3.— Effect of Mineral Manures on the yield of Barley (Grain and Straw). 

 Mean of Series A. N. and C. .M years (1^.V2-190'J). 



Plots 1, but tliey will have l)egiin to yellow for harvesl when 

 Plots 3 still show only upright green ears. 



