CONTENTS xiii. 



How to Kill Perennial Weeds. 177. How to Prevent 

 the Introduction of Weeds to the Farm. 178. Means at 

 Man's Disposal for Controlling Weeds. 179. The Con- 

 trol of Annual Weeds. 180. The Control of Winter An- 

 nual and Biennial Weeds. 181. The Control of Perennial 

 Weeds. 182. Poisonous or Otherwise Injurious Weeds. 



CHAPTER XIII. 



Irrigation Farming in Western Canada 234 



(By W. IJ. Fair field, Superintendent, Experimental 

 Farm, Lethbridge, Alberta) 183. History of Irrigation 

 in Western Canada. 184. Methods of Irrigation. 185. 

 Wild Flooding. 18(5. The Furrow System. 187. The 

 Bedding System. 188. The "Check" System. 189. The 

 Border System. 190. Sub^Irrigation. 191. Itelaltive 

 Suitability of Various Crops under Irrigation. 192. Ir- 

 rigating Timothy and Native Grasses. 193. Alfalfa 

 under Irrigation. 194. Grain Crops. 195. Potatoes. 

 190. Other Crops, Including Trees. 



CHAPTER XIV. 



The Causes and Control of Low Yields 247 



197. The Causes of Low Yields. 198. Poor Seed. 199. 

 Too Early or Too Late Seeding. 200. Too Much or Too 

 Little Seed per Acre. 201. Unsuitable Varieties. 202. 

 Shattering. 203. Late Breaking. 204. Seeding on Break- 

 ing Done the same Season. 205. Native Perennial 

 Plants in Stubble Fields. 206. Plowing When the Soil 

 is Too Wet or Too Dry. 207. Plowing Under Heavy 

 Stubble or Coarse Manure. 208. Too Late Plowing of 

 the Fallow. 209. Weeds. 210. Insects. 211. Plant 

 Diseases. 212. Heavy Spring Frosts. 213. Hail Storms. 

 214. Hot Winds. 215. Dry Seasons. 216. Fall Frosts. 



CHAPTER XV. 



The Management of Special Soils - 264 



(Drifting Soils). 217. The Damage Caused by Soil 

 Drifting. 218. The Chief Factors Favoring Soil Drift- 

 ing. 219. The Chief Causes of Soil Drifting. 220. 

 The Means Employed to Prevent Excessive Dam- 

 age. 221. Increasing the Moisture Content. 222. 

 Increasing the Organic Matter Content. 223. Modifying 

 the Structure of the Soil. 224. Growing Protecting 

 Crops. 225. Perennials as Protecting Crops. 226. Win- 

 ter Rye Lessens Drifting. 227. Late Sown Oats for 

 Soil Protection. 228. Stubble as a Soil Protector. 



