330 



INDEX 



Mineral manures continued. 

 Effect of, on Swedes, 120. 

 Effect of, on wheat, 48. 



N 



Nitrate of soda, comparison with ammo- 

 nium-salts, 44, 59, 60. 76, 82, 87, 

 107, 181, 157, 161, 163. 

 Effect on tilth, 296. 

 Nitrates, distribution in soil and subsoil, 



224. 



Due to fallowing, 63, 222. 

 Formed by bacteria, 218. 

 In drainage waters, 229. 

 In mangolds, 118. 

 Lost by drainage, 51, 63, 223. 

 Nitric acid in rain, 18. 

 Nitrification, 52, 196, 217. 236. 

 Of acid soils, 294. 

 Of ammonium-salts, 225. 

 Nitrifying organisms, distribution of,221. 

 Nitrite-forming bacteria, 218. 

 Nitrogen, accumulated by clover, 147. 

 Added to the soil by rain, 20. 

 Effect of, on quality in barley, 89. 

 Experiments on fixation of, 6, 8, 11, 



99. 



Gain or loss to the soil, 38, 210. 

 Gained or lost during feeding, 254. 

 In barley grain, 84, 89. 

 In plant, sources of, 3. 

 In soil, accumulated by wild herbage, 



139. 



Of manure recovered in crop, 54, 112 

 Nitrogenous constituents of food, and 



fat, 247. 



In fattening animals, 250. 

 And increase, 242. 

 And work, 245. 

 Nitrogenous manures, comparative effect 



on barley, 76. 

 Effect on grass, 161. 

 Effect on mangolds, 97, 116. 

 Effect of successive increments on 



yield of wheat, 45. 

 Effect on wheat, 42. 

 Injurious effect on leguminous crops, 



198. 



Injury caused by excess of, 102, 126, 

 162. 



Nodules on roots of leguminous plants, 



11. 

 Nutrition of animals, 240. 



o 



Oats, experiments on, 92. 

 Organic matter in rain, 20. 



In Rothamsted soils, 28. 



In manures, value of, 165. 



In soils, effect of, on bacteria, 220. 

 Oxen, composition of, 250. 



Partial sterilisation of soil, 274. 



Peas, 141. 



Percolation of rainfall through bare soil, 



22, 61. 



Phosphoric acid, function of, 59, 80, 87, 

 120. 



Importance to barley, 80. 



Importance to Swedes, 120, 196. 



In Rothamsted soils, 29, 54. 



Removed from soil by crops, 38, 212. 



Removed in drainage waters, 238. 



Value of, in wet seasons, 59, 87. 

 Pigs, composition of, 252. 



Experiments upon, 242. 

 Plant growth : effect on soil, 301. 

 Plantago lanceolata, 160, 181. 

 Poa pratensis, 162, 175. 

 Potassium salts, and carbohydrate for- 

 mation, 56, 117, 125. 



Depressing effect, 306. 



Diminishes incidence of fungoid 

 disease, 103, 165. 



Effect of, on grass land, 160, 164, 170 



Effect on leguminous plants, 159. 



Effect on turnips, 120. 



Function of, 56, 59, 87, 105, 117, 125, 

 129. 



In Rothamsted soils, 29, 54, 214. 



In soils, set free by lime, 168. 



Lost in drainage waters, 238. 



Removed from the soil by crops, 38, 

 212. 



Value of, for beans, 134. 



Value of, in dry seasons, 59, 87. 



Value of, with mangolds, 105, 111. 

 Potatoes, continuous growth of, 95, 123. 



