INDEX 



Amelioration of land, 73. 

 Ammonia and nitrogen, Rela- 

 tion between, 121. 

 Artificial manures, Use of, 161. 

 Atavism, 234. 

 Attraction of soil, Surface, 29. 



Bare fallowing, 96. 

 Barley in rotation, 211. 

 Basic Slag and Superphos- 

 phate, Relative values of, 126. 

 Basic Slag, Valuation of, 138. 

 Blood Meal, 125, 147. 

 Bone Ash, 137. 

 Bone-manures, 144. 

 Breeding plants, 232. 

 Broadcasting seed, 244. 



Calcareous soil, Properties of, 



58. 



Calcium cyanamide, 124. 

 Capillarity in soil, 28, 30. 

 Carbonic acid as^a weathering 

 f f*~ agent, 20. 

 Catch-cropping, 212. 

 Chalk soil, Properties of, 58. 

 Changing seed, 223. 

 Citric -soluble phosphate, 141. 

 Clay burning, 87. 

 Clay soil, Properties of, 55. 

 Cleanness of seed, 221. 

 Clover sickness, 133, 193, 200. 

 Cohesiveness of soil, 24. 



Denitrification, 65. 

 Density of seeding, 248. 

 Disease-resisting plants, 230. 

 Dominant characters, 242. 

 Drainage, Effects of, 76. 

 Drainage of land, 74. 

 Dried blood, 125, 147. 

 Drilling seed, 244. 



254 



Dry farming, 31. 

 Dung, Output of, 177. 



East Lothian rotation, 208. 

 Essential elements of plant 



food, 106. 

 Experiments, Field, 168. 



Fallowing, Bare, 96. 

 Farming, Dry, 31. 

 Farmyard manure, 173. 

 Field trials, 168. 

 Finger-and-toe, 93, 167, 193 



200. 



Fish guano, 147. 

 Formation of soil, 9. 

 Four-course shift, 203. 

 Frost uprooting plants, 77. 

 Frost a weathering agent, 17. 



Gas lime, 94. 



Glaciers as soil-forming agents 



23. 

 Grass land, Effects of phos 



phates on, 132. 

 Green manuring, 51. 

 Ground lime, 92. 

 Guano, Fish, 147. 

 Guano, Ichaboe, 160. 

 Guano, Peruvian, 160. 

 Guano, Phosphatic, 147. 



Heat, Absorption of, 41. 

 Heat of oxidation, 43. 

 Heat of soil, 38. 

 Heat, Sources of, 42. 

 Holderness rotation, 209. 

 Humus, Properties of, 60. 

 Hydration as a weathering 

 agent, 14. 



Ichaboe guano, 160. 

 Improvement of land, 73. 



