xii. CONTENTS 



Furrow Bottom. 131. Burning Stubble is Permanently 

 Wasteful of Soil Fertility, but Often Immediately Profit- 

 able. 132. Surface Cultivation Sometimes Preferable to 

 Plowing. 133. Early Fall Preferable to I, ate Fall Culti- 

 vation. 134. Avoid Working Tigbt Clay Soils when too 

 Wet 135. Harrow the Growing Crop only when there is 

 Cause for so Doing. 136. General Observations on Plow- 

 ing Stubble Land. 137. The Importance of "N'et" Re- 

 turns. 



CHAPTER X. 



The Summer Fallow 167 



138. The Function of the Fallow. 139. The Practices 

 of Fallowing. 140. Objections to Fallowing. 141. De- 

 fence of Fallowing. 142. General Conclusions. 



CHAPTER XL 



Crop Rotations 182 



143. What a Crop Rotation is. 144. The World's Best 

 Evidence on Rotations. 145. Results of Tests at Saska- 

 toon and Brandon. 146. Advantages of Suitable Crop 

 Rotations. 147. Requirements of Rotations in Western 

 Canada. 148. Difficulties in Establishing Good Rota- 

 tions in the West. 149. Classes of Crops used in Ro- 

 tations. 150. Planning a Rotation. 151. Some Well 

 Known Rotations. 152. Rotations now used in the West. 

 153. Rotation Tests at Brandon. 154. Typical Grain 

 Farming Rotations. 155. A Well Balanced Rotation. 

 156. The Most Profitable Rotation at Brandon. 157. 

 Rotations without Corn/ 158. A Rotation for a Dairy or 

 Stock Farm. -159. Observations on Rotation Tests at 

 Brandon. 160. Mixed Farming Rotations at Lacombe. 

 161. Criticisms of these Rotations. 162. A Rotation 

 with many Advantages. 163. Rotations with Sweet 

 Clover. 164. An Adjustable Rotation. 165. Crop Ro- 

 tations for Special Conditions. 166. The Effect of Rota- 

 tions on Soil Fertility. 167. General Conclusions Re- 

 garding Rotations. 



CHAPTER XII. 



Weeds and Their Control 211 



168. Why Weeds are Harmful. 169. Some Good points 

 About Weeds. 170. Principles of Weed Control. 171. 

 Identification of Weeds and Weed Seeds. 172. Duration 

 of the Growth of Weeds. 173. Habits of Root Growth 

 and Time of Seeding. 174. How Weeds Spread. 175. 

 How to Prevent Weeds from Developing Seeds. 176. 



