INDEX. 357 



Oats, 259; climate, 264; composition, 264; description and classification, 



260; diseases, 269; fertilisers, 265; harvesting, 268; history, 259; 



improvement, 264; production, 260; rate of seeding, 268; seed, 265; 



seed treatment, 267; soils, 264; South African varieties, 262; time 



of seeding, 267; uses, 269. 

 Old Man Saltbush, 350. 



Packers and Crushers, 27. 



Paspalum dilatatum and virgatum, 294, 295. 



Pea, chick, 328. 



Pea, field, 327. 



Pea, grass, 328. 



Peanut, ground nut or monkey nut, 161-166; climatic and soil requirements, 



163; cultivation, 164; description and composition, 162, 163; harvesting, 



164; improvement, 163; pests, 166; planting, 164; soil preparation, 164; 



uses, 165; yields, 165. 

 Percolation, 348. 

 Pests, Insect and Animal, barley, 276; cotton, 181; cowpea or kaffir bean, 



157; lucerne, 150; maize, 105-106; peanut, 166; potatoes, 138; sorghame, 



121; soybeans, 161; sugar cane, 225; tobacco, 214-215; wheat, 257. 

 Phenology, def., 6. 



Plant Food, availability of, 44; deficiencies, 45. 

 Ploughs, 25; Lister, 26; sub-soil, 26. 

 Potatoes, 122; climate, 127; cultural methods, 130; degeneracy discussed, 



135-136; description and classification, 124; diseases and pests, 137; 



harvesting, 134; history, 122; improvement, 135; planting, 130-133; 



rotations, 132; seed, 131; soil and manurial requirements, 128; structure 



and composition, 125; uses, 135. 

 Pumpkins, 320 ; cultural methods, 321 ; description, 320. 



Rainfall, 7; character, 9; distribution, 9; evaporation, 9; local annual fluc- 

 tuations, 8; run-off, 9; seasonal and annual distribution, 10. 



Rape, 308. 



Rechte Ganna, 351. 



Rhodes Grass, 296. 



Root and allied crops, 301-309. 



Rotation of Crops, 62-63; essentials of, 68; experiments in, 64; factors to 

 be considered, 70-71 ; reasons for rotative cropping, 68-70. 



Run-off, 347. 



Rural economics. 6. 



Rye, 277; description, 278; diseases, 280; general, 279; origin, 278; produc- 

 tion, 278 ; requirements, 279 ; varieties, 279. 



Sainfoin, 331. 



Seeders, 27. 



Soils of South Africa. 14-15; brak, 36; classification, 22; cohesion, 18; 



hard-pan, 19; light and heavy, 19; plasticity, 18; pore-space, 19; 



puddling, 19; root zone, 19; soil tilth, 19; structure, 18; texture, 18; 



tillage, treatment and characteristics of various soils, 23. 

 Sorghums, broom corn. 118; classification, 108; climate, 113; comparison 



■with maize, 109-10; composition, 109; description, 108; harvesting, 



116; history, 108; improvement, 118; origin, 108; pests and diseases, 



121; planting, 115; preparation of soil, 114; production, 108; rotations, 



115; score card, 119; seed, 114; uses, 118. 

 Soybeans, 58-162; composition, 160; cultural methods, 159; description, 158; 



diseases and pests, 161; history, 158; improvement, 161; uses, 160; 



varieties, 159. 

 Spekboom, 351. 



