Vlll ILLUSTRATIONS 



Corn Growing in Surface and Subsoil 76 



A Crop that Calls for Much Nitrogen 79 



A Crop that Gets Nitrogen from the Air 82 



A Sure Way to Improve the Soil 84 



Increasing the Nitrogen with Legumes 86 



Alfalfa Roots: Vegetable Tillage Tools 89 



A Good Job of Plowing 91 



Plowed for the First Time 93 



Effect of Plowing Wet Land 94 



Limed and Unlimed Land 100 



Using the Lime Spreader 105 



A Magnificent Crop of Beans 113 



Two Kinds of Bacteria Found in Decaying Vegetable Matter . 120 



Bacteria Usually Found in Decaying Organic Matter ... 121 



Some Bacteria that Cause the Fermentation of Urine . . . 123 



Nitrifying Bacteria 127 



Losing Nitrogen and Humus 132 



Root Tubercle Bacteria 139 



Back of Good Tillage is the Well-bred Farm Horse . . . 142 



Some Legume Roots Showing Root Tubercles 145 



Growing Bacteria in the Laboratory 149 



Alfalfa: the Best All-round Crop in America 150 



Red Clover Roots 153 



Soil Temperature 155 



A Way to Help the Drainage 156 



Losing Soils by Heavy Rains 158 



The Result when Water was Secured and Held 164 



Effect of Cultivation of Corn Crop 165 



Cultivation Checks Evaporation 166 



A Home-made Roller 169 



Disking the Ground before Plowing 171 



A Stone Mulch 173 



A Good Mulch 174 



Kaffir Corn 177 



Corn Planted with Disk Furrow-opener Attached .... 178 



Double Disking the Land 180 



"Out There in Kansas" 181 



Sub-surface Packing 182 



Dry Land Farming 183 



Ideal Plowing 186 



Furrow Slices that are too Flat 186 



