LIST OF ILLUSTRATIONS 



FULL-PAGE PLATES 



SIR JOHN BENNET LAWES, BART. .... To face page xxi 

 SIR JOSEPH HENRY GILBERT .... xxxii 



FIG. 17. Turf from Plot 3. Without Manure .\ 



156 

 ,) 18. Plot 5. Ammonium-salts alone .} 



19. Plot 17. Nitrate Soda alone. .\ 



158 



20. Plot 7. Full Minerals . j 



.. 22. Plot 8. Minerals without Potash .^ 



160 

 23. Plot 4-1. Superphosphate alone .J 



24. Plot 9. Full Minerals and Am-1 



monium-salts = 86 Ib. N. 



162 



25. Plot 11. Full Minerals and Am- 1 



monium-salts = 147 Ib. N. 



26. Plot 14. Full Minerals and Nitrate^! 



of Soda . 



164 



27. Plot 4-2. Superphosphate and Am- 

 monium-salts 



30. Plot 6. Full Minerals after Am-] 



monium . . . I 170 



31. Plot 15. Full Minerals after Nitrate] 



DIAGRAMS IN THE TEXT 



PAQ 



FIG. 1. Rainfall, Sunshine, and Mean Temperature . . . 16 



2. Broadbalk Wheat. Maintenance of yield during 10-year 



periods ....... 37 



3. Broadbalk Wheat. Effect of increasing amounts of Nitrogen 



on the production of Wheat (Grain and Straw) . . 43 



xvii 



