EFFECT OF NITKOCtEXOUS MAM IMS 



h;i 



amount on Plot 14. Considering Plots \) and 11-1 lirsr, it 

 will be seen that, large as is the amount of nitrogen ap})li('d 

 to Plot 9, the increased quantity on Plot 11- 1 has its 



Without Nitrogen 

 .A. 



With Nitrogen 



Fig. 21.— Effect of the various Ash constituents with and without Nitrogen on the 

 produc-e of Hay per acre. Average over 47 years (1 S.'iG-l 902). 

 Plots 3 and 12. Unmanured. Plot 4-2. Super, and Amm.-salLs ^ >t; lb. N. 



Plot 4-1. Superphosphate. Plot 10. Minerals (without Potash) and 



Plot 8. Minerals with Potash. Amm.-salLs - S»i lb. N. 



Plot 7. Complete Mineral Manur.'. Plot 9. Complete Mineral >I:inun- and 



' Amm. -salts ^') lb. N. 



effect in an increased crop. On Plot the liay has averaged 

 54 cwt. over the whole period, on Plot ll-l the crop is 

 increased to more than 65 cwt. Comparing these results with 

 the 39 cwt. obtained from IMot 7 (minerals without nitrogen), 

 it will be seen how gi-eat is the effect of nitrogen in the produc- 

 tion of hay. The hay, however, is by no means so good in 



