LIST OF ILLUSTRATIONS Xxix 



FIGURE PAGE 



116. Cutting Swedish Select oats with the self binder . . .371 



117. Sixty-day oats in the shock ....... 372 



118. Thrashing Winter wheat in Texas Panhandle (Leidigh) . 373 



119. Manure-spreader at work (U. S. Dept. Agr.) . . . 381 



120. Difference in growth of individual wheat plants in different 



methods of cropping (Blanchard) .... 383 



121. Wheat after wheat at Modesto, Cal. ; to be compared with 



Fig. 122 (Blanchard) 384 



122. Wheat after rye and vetch turned under, at Modesto, Cal. ; 



to be compared with Fig. 121 (Blanchard) . . .385 



123. Plowing under rye for green manure in preparation for 



Winter wheat (Blanohard) 386 



124. Potatoes in rotation at the Nephi, Utah, substation . . 388 



125. Summer tillage in Utah 390 



126. Disk plows in three gangs, run by steam, in the Juab Val- 



ley, Utah 400 



127. Near view of an 8-disk gang plow 400 



128. Corrugated roller (U. S. Dept. Agr.) 401 



129. Slicker with revolving rod behind (U. S. Dept. Agr.) . 401 



130. Knife weeder (U. S. Dept. Agr.) 402 



131. Right-lap cutaway disk harrow (U. S. Dept. Agr.) . . 403 



132. Harrowing sage brush into winrows 404 



133. Virgin soil of cleared sage brush land ready for seeding 



(U. S. Dept. Agr.) 405 



134. Press drill 409 



135. Harrowing Winter wheat (U. S. Dept. Agr.) . . .411 



136. Harvesting with the combined harvester-thrasher (Blanch- 



ard) 416 



137. Combined harvester-thrasher drawn by an engine . . 416 



138. Small combined harvester-thrasher, propelled like a header 



(Blanchard) 417 



139. Irrigation canal at the Huntley Reclamation Project . . 433 



140. Field of wheat badly injured by alkali on the Truckee- 



Carson Reclamation Project (Ball) . . . .436 



141. Seeds of twelve important weeds of grain fields (Hillman) . 442 



142. Seeds of twelve important weeds of grain fields (Hillman) 443 



143. Wild garlic (U. S. Dept. Agr.) 458 



144. Canada thistle (U. S. Dept. Agr.) 460 



145. Hedge bindweed (U. S. Dept. Agr.) 462 



