An Account of the Soil 



[PT. I 



Fig. 2. Effect of increasing 

 dressings of fertilisers on the 

 yield of wheat, Broadbalk, 

 Rothamsted. 



Plot 3. No manure. 



Plot 5. Manure complete ex- 

 cept for one constituent- 

 Nitrogen is omitted. 



Plot 6. Complete manure con- 

 taining 43 lbs. Nitrogen per 

 acre. 



Plot 7. Complete manure con- 

 taining 86 lbs. Nitrogen per 

 acre. 



Plot 8. Complete manure con- 

 taining 129 lbs. Nitrogen per 

 acre. 



Plot '.i 5 



