rii ILLUSTRATIONS 



131. Growth of Barley on Partly and Fully Reclaimed Alkali Land 288 



132. Wheat on Reclaimed Alkali Land Near Fresno, Gal 289 



133. A Dwarfed Bushy or Leafy Corn Plant Growing on Alkali Soil of 



Humid Area 291 



134. Difference in Growth on Light and Dark Colored Soils 303 



135. Showing the Comparative Areas Covered by the Sun's Rays When 



Vertical, 30, 60 and 80 Degrees from the Vertical 304 



136. Effect of Slope on the Area Covered by the Sun's Rays 305 



137. Diagram Showing the Theoretical Action of the Plow 327 



138. Showing the Three Types of Mold-boards 327 



139. Plow with Separate Jointer and Rolling Coulter Attached Ready for 



Use 328 



140. The Combined Jointer and Rolling Coulter 329 



141. Disk Plow 329 



142. Lister for Preparing the Ground and Planting Corn 330 



. 143. Work Done by Lister 331 



144. Subsoil Plow 331 



145. Spike-tooth Harrow 332 



146. Spring-tooth Harrow 332 



147. Acme Blade Harrow 333 



148. The Solid Disk 333 



149. The Cut-away Disk 334 



150. The Spading Disk Harrow 334 



151. Smooth or Drum Roller 335 



152. The Culti-packer, a Form of Corrugated Roller, Showing Work Done 336 



153. Disk Drill and Its Work 336 



154. Press Drill 337 



155. Ordinary Corn Planter with Attachment for Planting Cowpeas in 



Hill or Row with Corn 338 



156. Three-shovel Cultivator 338 



157. Disk Cultivator 339 



158. Surface or Blade Cultivator with Leveler 339 



159. Weeder 340 



160. An Early Form of Plow 340 



161. The Sod is Well Turned and Represents Good Wo: k 341 



162. Good Plowing in Stubble Land 342 



163. A Crooked Furrow Does Not Look Well 342 



164. Previous to Plowing, Disking Should be- Done 344 



165. Grain Produced from Five Tenth-acre Plots Prepared in Different 



Ways for Winter Wheat 346 



166. A Good Seed Bed on Stalk Ground 348 



167. Nine-year Average Yield 43.3 Bushels Per Acre. ' 351 



168. Nine-year Average Yield 48.9 Bushels Per Acre 351 



169. Nine-year Average Yield 7.4 Bushels Per Acre 351 



170. Yields of Corn (Field Weight) with Different Methods of Tillage. . 354 



171. Yield of Corn (Field Weight) with Different Method of Tillage. ... 354 



172. Level Cultivation 355 



173. Ridged Cultivation with Drilled Corn 356 



174. Two Hundred Square Miles of Once Forested Mountains in China. . 359 



175. Sweet Clover on Badly Eroded Land 361 



176. Cultivated Terraces in China 364 



177. Guide-row Terraces 365 



178. Level-bench Terrace 366 



179. A Terraced Park in Mississippi 367 



180. The Mangum Terrace 367 



181. Locusts Growing on Gullied Land 368 



