xvi TABLE OF CONTENTS 



CHAPTER IX 



PAGES 



THE TIME OF IRRIGATION 173-188 



The ideal principle, 173 Fall irrigation, 175 Winter 

 irrigation, 178 Early spring irrigation, 181 Irrigation 

 during growth, 182 Time of irrigating short-season 

 crops, 183 Time of irrigating long-season crops, 184 

 Night versus day irrigation, 187. 



CHAPTER X 



THE METHOD OF IRRIGATION 189-215 



Sub-surface irrigation, 189 Surface irrigation, 193 

 Permanent ditches, 196 Field-ditch or field-lateral 

 method, 198 The border method, 202 The check 

 method, 202 The basin method, 207 The furrow 

 method, 207 Summary, 214. 



CHAPTER XI 



CROP COMPOSITION 216-230 



Groups of plant constitutents, 217 Water, 217 Ash, 

 219 Protein, 220 Fat, 223 Carbohydrates, 224 

 Sugars, 224 Starch, 226 Woodiness, 226 Color and 

 flavor, 227 Flour, 227 Cooking value, 228 Effect 

 of cultural treatment, 228. 



D. CROPS UNDER IRRIGATION 



CHAPTER XII 



THE USE OF THE RAINFALL 231-239 



Irrigation supplementary to rainfall, 231 Crop-pro- 

 ducing power of rainfall, 232 Results of dry-farming, 

 233 Crop value of rainfall in irrigation, 233 Conserv- 

 ing the rainfall, 235 Distribution of rainfall, 235 

 Storing water in the soil, 236 Cultivation, 237 Pro- 

 portion of rainfall conserved, 237 Relation of irriga- 

 tion and dry-farming, 237 Dry-farm homesteads, 238. 



