358 INDEX. 



Spineless Cactus, 350. 



Sugar Beet, 302. 



Sugar (Jane, 216; agual, 219; classification, 218; climatic requirements, 



219; description, 217; diseases and pests, 225; harvesting, 222; history 



216; irrigation, 223; keeping qualities of cane, 223; manuring, 221; 



wilting, 224; origin, 216; planting, 221; production, 216; "seed/' 218; 



soft canes, 219; soil preparation, 221; soil requirements, 220; Uba, 219; 



uses, 224 ; varieties, 217. 

 Sulla, Spanish sainfoin, 331. 

 Sunflowers, analysis, 320; composition, 319; climate, 318; cultural methods, 



318; harvesting, 318; silage, 319: soil, 318; uses, 319; varieties, 318. 

 Sweet Clover, 334. 

 Sweet Potato, 335 ; climatic and soil requirements. 335 ; cultural methods, 



336 ; uses, 337 ; yield and production, 337. 

 Swedes, 307. 



Tillage, definitions, 18-19; objects of, 17; tilth, 18; when to till, 20. 



Tobacco, 184; air-curing, 201; burning qualities, 213; care of seed beds, 

 192; changes during^ ripening and curing, 199; chief tobacco produc- 

 ing districts. 189 ; classification, 190 ; covering, 192 ; curing, 198 ; 

 description, 190; development of colour, 199; diseases and pests, 214- 

 15; fire-curing, 203; flue-curing, 204; history, 184; management after 

 curing, 207; production, 185; quality, 186; seed beds, 190; soil, 190; 

 soil preparation, 190; sowing, 191; sterilising, 191; seed selection, 192; 

 time of sowing, 192; Turkish tobacco, 208-12; types, 186; Virginian 

 tobacco. 194-198 ; relation of nicotine to quality, 212. 



Turnips, 307. 



Vetches, 328; cultural methods, 330; habits of growth, 328; mses, 330. 



Water, capillary, 341; gravitational, 342; hygroscopic, 340; requirements of 

 plants, 343. 



Water supply, character of, 28 ; nature of soil in relation to, 29. 



Weeds, proclaimed in South Africa, 57; control of, 60; dodder, 60; 

 injurious effects of, 58; khaki bos, 61; kweek, 61; roobloem, 61; 

 witchweed. 61. 



Wheat, 226; class, 227-236; climate, 245; common wheats, 237; composition, 

 239 ; cultivation, 250 ; diseases and pests, 257 ; early and late, 237 ; 

 factors affecting chemical and physical composition of wheat, 241-244 ; 

 fertilisers, 246; grazing, 252; hard and soft. 239; harvesting, 253; im- 

 provement, 253 : irrigation, 250 ; origin, 227-236 ; principal South Afri- 

 can wheats. 236 ; quality, 239 ; rotations, 251 ; seed, 247 ; seed 

 treatment, 248; soils, 246"; South African production, 227; structure, 

 239; threshing. 253; uses, 253; world's production. 226. 



Wilting, co-efiicient. 342. 



