166 EXPERIMENTS UPON GRASS LAND 



Cwt.perAcre 

 ' 60 - 



50 - 



Plots 3&12 



14 



[Fio. 28. Effect of Nitrogenous Manures on the produce of Hay per acre. Average 



over 47 years (1856-1902). 



Plots 3 and 12. Unmanured. 



Plot 7. Complete Mineral Manure, no Nitrogen. 

 Plot 9. Do. and Amm. -salts = 86 Ib. N. 



Plot 11. Do. do. =129lb. N. 



Plot 16. Do. and Nitrate of Soda = 43 Ib. N. 



Plot 14. Do. do. =861b. N. 



