GRASS FOR HAY 



23 



Quaking Grass, so generally taken as a sign of poor land, which con- 

 stituted 20 per cent, of the whole herbage in 1903, and Sheep's Fescue ; 

 among leguminous plants the Bird's-foot Trefoil ; and Burnet, Hawkbit, 

 and Black Knapweed among the weeds. 



Use of Nitrogenous Manures alone. 



Three of the plots — 17, 5, and 1 — show the effect of the long-con- 

 tinued use of nitrogenous without any mineral manures, Plot 5 for forty- 

 two years received 86 lb. of nitrogen as ammonium-salts, Plot 17 half 

 the quantity of nitrogen in the shape of nitrate of soda, and Plot 1 the 

 same half quantity of nitrogen as ammonium-salts, though on this plot 

 dung was applied in each of the first eight years of the experiment. The 



Without Nitrogen. 



With Nitrogen. 



Cwt. perAcrt 

 SO 



Plots 3&I2 



Fig. 6. — Eflfect of the various Ash constituents with and without Nitrogen on the 

 produce of Hay per acre. Average over 47 years (1856-1902). 



Plots 3 and 12. Unmanured. 



Plot 4-1. Superphosphate. 

 Plot 8. Minerals with Potash. 

 Plot 7. Complete Mineral Manure. 



Plot 4-2. Super, and Aram.-salts = 86 lb. N. 

 Plot 10. Minerals (without Potash) and 



Amra.-salts = 86 lb. N. 

 Plot 9. Complete Mineral Manure and 



Amm.-salts = 86 lb. N. 



