xviii LIST OF ILLUSTRATIONS 



DIAGRAMS IN THE TEXT continued. 



PAGE 



Fio. 4. Comparison of Nitrate of Soda and Ammonium-salts on 



Wheat . . 45 



5. Relation between Cost of Production and Returns with 



varying quantities of Manure ... 47 



6. Production of Wheat with varying Mineral Manures . 48 



n 7. Loss of Nitrogen as Nitrates in the Drainage Water, Ib. 



per acre . . . . . . .50 



)f 8. Comparative Effects on Wheat of Ammonium-salts applied 



at different times ...... 53 



9. Effect of Wet or Dry Autumns on continuous Wheat, and 



Wheat alternated with Fallow .... 64 



10. Yield of Barley during successive 10-year periods (1852- 



1911) ....... 74 



11. Yield of Barley (Grain and Straw) with different sources 



of Nitrogen ...... 77 



12. Barley. Total Produce, showing residual effect of Dung and 



no Manure in relation to the Dung Plot = 100 . . 79 



13. Effect of Mineral Manures on the Yield of Barley (Grain and 



Straw) . . . . . . .81 



14. Mangolds. Effect of increasing amounts of Nitrogen . 101 



15. Mangolds. Effect of various Mineral Manures . . 104 



16. Mangolds. Effect of addition of Mineral Manure to Dung, 



with various Nitrogenous Cross-dressings . , . 110 



21. Effect of the various Ash constituents- with and without 



Nitrogen on the produce of Hay per acre . . 161 



28. Effect of Nitrogenous Manures on the produce of Hay per 



acre . . . . . . .166 



29. Progressive Effect of Changes in the Manuring on the Com- 

 position of the Hay Crop . . . . .169 



32. Percentage of Antkoxanthum odoratum in the Herbage of the 



Grass Plots ...... 172 



33. Percentage of Fesiuca ovina in the Herbage of the Grass 



Plots . . . . . . . 174 



34. Percentage of Alopecunts pratensis in the Herbage of the 



Grass Plots ...... 176 



35. Percentage of Arrhenatherum avenaceum in the Herbage of 



the Grass Plots . . . . . .178 



36. Percentage of Holcus lanatus in the Herbage of the Grass 



Plots 180- 



