CH. viii] Slag on Grass Land 151 



discussed later (p. 214) according to which the largest 

 return per unit quantity of manure applied is obtained 

 from small dressings: it happens because the effect of 

 slag is in a large measure indirect, the improvement 

 arising from the stimulation of the clover. Experiments 

 at Cockle Park^ and elsewhere have demonstrated the 

 great increase in feeding value of the herbage treated 

 with slag. It has also had a remarkable effect on the 

 downland pastures of Sussex and Hampshire, seen for 

 example at Sevington in Hampshire^, and on Prof. 

 Somerville's farm, Poverty Bottom, at Newhaven^. 

 The older practice was to apply it in autumn or winter 

 but later work has shown that spring and even summer 

 dressings are also good. 



In dry situations, however, it proves less effective, 

 e.g., on some of the Hertfordshire gravels and on the 

 downland of East Kent. Sometimes the failure is due 

 to lack of potash, which can be remedied by addition of 

 kainit*. 



It is valuable on arable land for swedes and turnips 

 wherever there is any tendency to finger and toe, and 

 it also increases the feeding value of the roots. 



The fixed price of slag is : 



Over 3| million tons are produced each year. 



^ These are summarised in Prof. Somerville's paper, Journ. Bd. ofAgric, 

 Supplement, Jan. 1911. 



2 Journ. Bath and West Society, reported annually, 1901 onwards 

 = Journ. Bd. of Agric. 1918, xxiv. 1186. 



* E.g., see Woburn Experiments, Journ. Roy. Agric. Soc, 1907. 

 ^ See footnote, p. 131. 



