CONTENTS 



Chapter Page 



I. Functions of the Plant Organs 5 



II. Influence of Water 14 



III. Importance of Air in the Soil 27 



IV. Soil Temperature 32 



V. Why Soils Must Be Handled Differently 37 



VI. Depth of Plowing 51 



VII. When to Plow 63 



VIII. Plowing to Kill Insects 72 



IX. Plowing to Kill Weeds 79 



X. Plowing Under Green Manure 87 



XI. Judging Plowing 92 



XII. Plow Bottoms 97 



XIII. Plow Bottom Metals 129 



XIV. Scouring Troubles 137 



XV. Setting the Share on the Plow 1 49 



XVI. Sharpening Soft Center Steel Shares. ... 154 



XVII. Sharpening Crucible Steel Shares 158 



XVIII. Sharpening Chilled Shares 159 



XIX. The Rolling Coulter 160 



The Jointer 



The Combined Rolling Coulter and 

 Jointer 



XX. The Tractor Plow Hitch 167 



XXI. Adjusting Horse Plows 183 



XXII. Middle Breakers 189 



XXIII. Disk Plows.. 195 



