xviii Contents 



PAGES 



Small Fruit Irrigation. Frequent irrigation needed for 

 strawberries Watering alternate rows to facilitate 

 Picking 383, 384 



Garden Irrigation. Bed irrigation Bailing system Ridge 

 and furrow method Basin flooding At .Gennevilliers 

 At San Bernardino 384-391 



Irrigation of Lawns and Parks. Inadequacy of spraying 



Rainfall of humid climates not usually sufficient 391-396 



Sub -irrigation. Not economical of water Water not ap- 

 plied where most effective Unequal wetting of the 

 soil First cost heavy May be applicable in certain 

 cases 396-402 



CHAPTER XI 



SEWAGE IRRIGATION (pages 403-414) 



Objects Sought in Sewage Irrigation. Destruction of or- 

 ganic products Utilization of fertility carried 403 



Climatic Conditions Favorable to Sewage Irrigation. Warm 

 climates best suited Cold soils chiefly filters Large 

 area required for winter handling 404, 405 



Process of Sewage Purification by Irrigation and Intermit- 

 tent Filtration. Essential conditions Effect of too 

 rapid application 405, 406 



Soils Best Suited to Sewage Irrigation. Lighter loams and 



sandy soils Any soil adapted if area is sufficient 406 



Desirability of Wider Agricultural Use of Sewage in Irriga- 

 tion. Examples of valuable results Sections of country 

 specially adapted to it 406-409 



Crops Suited to Sewage Irrigation. Grass, most generally 

 Soil for intertillage crops fertilized by winter irriga- 

 tion Potatoes at Croyden May injure grass if applied 

 in winter 409-413 



Influence of Sewage Upon the Health. At Gennevilliers 



Purity of effluent compared with well water 413, 414 



