41 



Experiments in Soil Management. — Contd. 



CHALKING. 



Barley (Plumage Cross). Great Knott Wood Field, 

 1913 and 1914. 



Both plots manured with i cwt. Sulphate Ammonia and 2\ cwt. 



Superphosphate per acre in 1913, and in 1914 1 cwt. Sulphate Ammonia 

 and 2 cwt. Superphosphate. 



Oats (Grey Winter). Sawpit Field, 1914. 



(1) From excavations for Harpenden Sewage Beds. (2) From Rothamsted Fields. 



Potatoes (Dalhousie). Great Harpenden Field, 1914. 



SUBSOILING. 



Potatoes (King Edward VII). Great Harpenden Field, 1914. 



