306 



The Wohurn Pot- Culture Experiments^ 1914. 



and ground chalk respectively have been used, 

 also seems to have done better than lump lime. 



Ground lime 



Rainfall at Woburn Experimental Station, 1914. 

 (292 ft. above sea level.) 



II. 

 III. 



IV. 

 V. 



POT-CULTURE EXPERIMENTS, 1914. 



Hills' Experiments : — 

 (a) The influence of Copper Salts on Wheat, 

 (ft) The influence of Lead Salts on Wheat. 



The relation of Lime to Magnesia in Soils. 

 The addition of Lime to a Soil rich in Magnesia. 



Acidity of Soils. Stackyard Field, Continuous Barley, 

 1914. 



Inoculation of Crops (Bottomley's Peat Preparation). 



Sewage Sludge Experiments. 



I. The Hills' Experiments — {a) The influence of Copper 

 Salts on Wheat. 



Experiments with copper salts were first tried at Woburn 

 in 1913, the salts then used being the sulphate and the 

 carbonate. These experiments derived special importance 

 from the fact that at the Rothamsted Experimental Station 

 Miss (Dr.) Brenchley had found that, as the result of carrying 

 out experiments in water-culture, copper salts were peculiarly 

 harmful to vegetation. 



The experiments of 1913 carried out at Woburn on soil 

 instead of by water-culture did not bear out to anything like 

 the same extent the conclusions formed by Miss Bi-enchley, 

 but showed that there was a distinct difference between water- 

 culture and soil-culture experiments. Water-culture must, at 

 best, in my opinion, be regarded as a verj' artiflcial method, 

 and, though it may l)e useful by way of comparative tests and 

 for forming a general indication of what may be expected to 



