430 



INDEX 



Peaches, brown-rot of, 252; danger in 

 spraying, 262; propagation of, 42, 43, 

 45; references, 243. 



Peanut, inoculation, 192; seed vitality, 

 405. 



Pears, how dwarfed, 47; propagation of, 

 42, 45; references, 243. 



Pear-blight, 249. 



Peas, fertility in, 408; inoculation of, 

 192; seed vitality, 405; weight per 

 bushel, 406. 



Peas-and-barley, digestible nutrients in, 

 410. 



Peas-and-oats, digestible nutrients in, 

 410. 



Peas-barley-and-oats, 182. 



Pea-vine silage, digestible nutrients in, 

 410. 



Pea-vine straw, digestible nutrients in, 

 410; fertility in, 408. 



Pecan, grafting, 42. 



Pedigreees, 330; advanced registry, 333; 

 value of, 331. 



Percheron horses, popularity of, 307. 



Perennial, denned, 38. 



Phosphoric acid. See Phosphorus. 



Phosphorus, amount in soils, 113, 114; 

 comparative effects of different forms, 

 133; deficiency in soils, 134; effect on 

 seed formation, 64; food for plants 

 and animals, 60, 62; forms of in fer- 

 tilizers, 123; in manure, 136, 139, 140, 

 141; losses from manure, 141; of 

 food recovered in manure, 138; 

 reinforcement for manure, 142, 144, 

 149; relation to lime, 132. 



Physics, relation to agriculture, 1 . 



Pigs. See Hogs. 



Pineapple, references, 34, 243. 



Pistil, denned, 11. 



Plants, composition of, 60; periods in the 

 life of, 69; storage of food in, 69; the 

 only source of starch, 69. 



Plant-breeding forms, 31. 



Plant diseases, discussion of, 248 con- 

 trol of, 214. 



Plant-food, chapter on, 60; amount of, 

 in soils, 113; deficiency in soils, 63; 

 elements required, 60; how taken up, 

 64, 66, 67; sources of, 61 . 



Plant lice, life history of, 257; contro 

 of, 265. 



Plowing, depth, 164; spring vs. fall, 

 163; sub-soiling, 165. 



Plums, black knot of, 251; brown-rot 

 of, 252; danger in spraying, 262; 

 propagation of, 42, 44, 45. 



Plymouth Rock hens, 364. 



Poland-China hogs, 358, 359, 360. 



Polled Durham cattle, 325. 



Poplars, propagation of, 41. 



Population of the United States, 418. 



Potash. See Potassium. 



Potassium, amount in soils, 113, 114; 

 defined, 11; effect on seed formation, 

 64; ferro cyanide, 264; food for plants 

 and animals, 60, 62; forms of in fer- 

 tilizers, 125; in manure, 136, 139, 

 140, 141; losses from manure, 141; 

 muriate of, fertility in, 408; of food 

 recovered in manure, 138. 



Potassium chlorid, 125. 



Potassium nitrate, fertility in, 408. 



Potassium sulfate, 125; fertility in, 408. 



Potato, area necessary for profit, 272; 

 averages for ten-year periods in the 

 United States, acreage, production, 

 yield per acre, total value, value per 

 acre, value per bushel, 417; breeding, 

 21, 30; composition of, 62; digestible 

 food per acre, 160; digestible nutri- 

 ents in, 410; flea-beetle, 261; fertility 

 in, 408; method of reproduction, 12; 

 nativity of, 154; planting, prepara- 

 tion for, 40; planting rate, 405; pro- 

 pagation of, 39; production value as 

 feed, 412; references, 35, 243, 270; 

 rotations with, 147, 274; seed, size 

 to cut, 39; seed, storage, 40; seed, 

 time to cut, 41; spraying, 266; value 

 of, 155, 413, 417; water requirement, 

 67; weight per bushel, 406; world's 

 crop, 154. 



Potato-beetle, control of, 259. 



Potato-blight, control of, 254. 



Potato scab, control of, 253. 



Potato, sweet, See Sweet potato. 



Poultry, chapter on, 363; as food, 

 reference, 300; ash for, 286; breeds 

 of, 363; feeding, 365; feeding stan- 



