432 



INDEX 



Self-fertilization, 12. 



Septic tank, 393. 



Sessile, denned, 37. 



Sewer system for farm, 391. 



Sexual reproduction, 12. 



Shade trees, 138. 



Shavings as bedding, 138. 



Sheep, chapter on, 351; averages for 

 ten-year periods in the United States, 

 total number, total value, value per 

 head, 418; breeds of, 351; composi- 

 tion of, 285; cottonseed for, 212; 

 feeding standards, 409; fertilizing 

 value of feed recovered in manure, 

 138; manure, amount and value per 

 year, 138, 139; numbers of, 357, 418; 

 opportunities in raising, 355; refer- 

 ences, 299, 356; silage for, 176; types 

 of, 351; values of, 357, 418. 



Shorthorn cattle, 325; fat in milk, of 

 328; origin of polled, 8. 



Shoulders, care of sore, 313. 



Shrinkage of products, reference, 242. 



Shropshire sheep, 351, 353. 



Shrubs, 389. 



Silage, materials for, 172. See Corn 

 silage. 



Silicon as food for plants and animals, 

 60, 62. 



Silk, exports and imports, 414. 



Silo, 171, 173; cost of filling, reference, 

 242; principle of, 172. 



Smut, control of, 254. 



Sodium, food for plants and animals, 

 60, 62. 



Sodium nitrate. See Nitrate of soda. 



Soils, chapter on, 75; analysis, physical, 

 76; analysis, value of chemical, 113; 

 best kinds of, 83, 375; composition of 

 soils, 76; defined, 75; for alfalfa, 190; 

 clover, 193-195; corn, 78, 163; cotton, 

 78, 206; grass, 78, 82, 183-188; oats, 

 78, 181; tobacco, 82; vegetables, 78, 

 82; wheat, 82, 180; wood lot, 223; how 

 formed, 109; how named, 78; man- 

 agement of clay, 83; plant food in, 

 113, 114; references, 108, 152; rock 

 particles of, 76; size of particles and 

 crop adaptation, 78, 82; size of par- 

 ticles and water capacity, 79, 80; 



warm and cold, 81; water capacity, 

 determination of, 105; water capacity 

 of clay and sand, 80. See, also, Irri- 

 gation and Drainage. 



Soil air, importance of, 94; determina- 

 tion of the amount of, 103. 



Soil-bacteria. See Soil organisms. 



Soil fertility, chapter on, 109; amount 

 in soils, 113; causes of loss of, 111; 

 how developed, 104; how lost, 109; 

 importance of grass, 120; importance 

 of legumes, 116. 



Soil humus, amount in soils, 96; im- 

 portance of, 95. 



Soil organisms, 116-122. 



Soil particles, effect on labor, 82; floc- 

 culation of, 83; importance of size of, 

 79-84; relation to crop adaptation, 



78, 82; relation to water capacity, 



79, 80; separation of, 76; size of and 

 temperature, 81 ; surface area per 

 cubic foot, 80. 



Soil water, best amount of, 91; com- 

 position of, 84; conserved by early 

 plowing, 164; conservation of, 85; 

 how amount is determined, 72; 

 importance of, 84; movement of, 85. 



Sorghum, references, 243. 



South Carolina rock, 123. 



Southdown sheep, 351, 354. 



Soy-bean, digestible nutrients in, 410; 

 fertility in, 409; inoculation, 118, 192; 

 lime requirement, 126; references, 

 243; seed vitality, 405. 



Soy-bean hay, productive value as feed, 

 411. 



Soy-bean straw, fertility in, 409. 



Spores, 36, 251. 



Sports, 8. 



Spraying, for insects and diseases, 258; 

 for mustard, 246; profits, from 229; 

 references, 270. 



Squash, seed vitality, 405. 



Stamen, defined, 11. 



Standardized milk, 336. 



Starch as food, 286; composition of, 68; 

 how formed, 68; translocation of, 68. 



Stigma, defined, 11. 



Stolon, defined, 38. 



Stomata, 67. 



