i66 



INDEX 



INDEX TO MAIN SUBJECTS OF RESEACH. 



PAGE 



The Soil and Plant 

 Growth. 



Rothamsted Experimental 

 Station : — 

 Soil bacteria and protozoa 8 

 Soil nitrates and bacteria - 1 1 

 Farmyard manure and clover i z 

 Artificial farmyard manure 14 

 Green manuring - - 17 



Effect of liming on compo- 

 sition of herbage - 18 

 " White roots " of barley 



and wheat - - - 18 

 Plant poisons as stimulants 19 

 Farm weeds - - - 19 



Crop statistics - - - 20 

 Physical properties of the 



soil - - - - 21 



Dynamometer tests - 25 



Soil acidity (also at School 

 of Agriculture, Cam- 

 bridge, University ol 

 Leeds, and University 

 College of North Wales, 

 Bangor) - - - - 26 

 University of Leeds : — 



" Flocculation " in soils - 23 

 Midland Agricultural and 

 Dairy College : — 

 Willows : cultivation and 

 subsequent treatment - 20 



Plant Breeding. 



Plant Breeding Institute, Cam- 

 bridge : — 



Wheat breeding - - 30 



Oat breeding - - - 32 



Barley breeding - - 32 



Potato breeding - - 33 



Factors contributing to 



yield - - - - 38 



Influence of root system - 39 



Plant Breeding Institute, 

 Aberystwyth : — 

 Breeding of herbage plants 34 

 Oat breeding - - - 37 

 Influence of root system - 39 



PAGE 



Plant Physiology. 

 Imperial College of Science : — 

 Factors influencing crop 



yield - - - - 42 

 Resistance to disease- - 45 



Electrical treatment of 



crops - - - - 47 



Fruit-Growing and 

 Preserving. 



Agricultural and Horticultural 

 Research Station, Long 

 A shton : — 

 Root-stocks, classification of 5 1 

 Root investigations - - 55 

 Treatment of the tree. 

 (Ringing, Pruning, Use 

 of intermediate stocks) - 58 

 Manuring - - - - 62 

 Fruit breeding - - - 63 

 Cider and perry investiga- 

 tions - - - - 65 

 Fruit and vegetable preser- 

 vation and storage (and 

 at Campden Experimen- 

 tal Factory) - - 66 



East Mailing Research 

 Station : — 

 Root-stocks, classification of 51 

 Pruning - - - - 60 

 Manuring - - - - 63 



Plant Diseases. 



Rothamsted Experimental 



Station : — 



Fungi and algae in soil - 70 

 Possibility of change in 



fungi and bacteria - 71 



Basis of spraying - - 71 



Wart disease of potatoes - 72 

 Insects and allied organisms 



in soil - - - - 84 



Plant lice, or green fly - 85 



Chemotropism - - - 86 



Insecticides and fungicides 97 



