79 



TOP DRESSING EXPERIMENT. 



Oats (Grey Winter). Great Harpenden Field, 1919. 



Wheat (Red Standard). jGreat Harpenden Field, 1920. 



Single dressing represents 100 lbs. Sulphate Antm. and 100 lbs Super. 



SUBSOILING EXPERIMENT. 



Potatoes (King Edward). West Barnfield, 1918. 



VARIETY EXPERIMENT. 



Wheat. Great Harpenden Field, 1920. 



