496 



INDEX 



Clover hay market grades, 484 

 Clovers, 375, 398 



alsike, 406 



burr, 415 



crimson, 414 



Japan, 417 



red, 398 



sweet, 410 



white, 408 

 Composition of buckwheat, 198 



cereals, 27 



effect of climate, 28 



flax, 241 



peanuts, 441 



plants, 7 



potatoes, 264 



tobacco, 459 



Avheat plants, 125, 126 

 Corn, 41 



adaptation of, 56 



belt, 41 



classification, 44 



cost of producing, 85 



crossing, 59 



crows in, 89 



depth of cultivation, 77 



distribution of (map), 42 



effect of climate, 55 

 rainfall, 56 

 weeds, 77 



germination tests, 63 



growth of, 48 



harvesting, 80 



hybridizing, 51 



improvement of, 59 



judging, 93 



length of growing season, 56 



market grades of, 490 



origin of, 43 



outline for describing, 97 



planting, 69 



preparation of land, 67 



production of, 41 



proportion of parts, 84 



roots, 49 



score card, 102 



selection of seed, 60 



shrinkage of, 85 



soils for, 55 



study of types, 91 



tassel and ear, 49 



tillage. 74 



tillers, 49 



uses of, 86 



varieties to grow, 58 



Corn, varieties to grow, number of, 

 48 



yield of, 73 

 Ccst of producing corn, 85 



wheat, 133 

 Cotton, by-products, 215 



classification, 207 



climate for, 218 



cultivation, 229 



culture, 218, 225 



diseases, 235 



early history, 205 



fertilizers for, 221 



fiber, 212 



gin, 206 



harvesting, 231 



insect enemies, 234 



marketing the crop, 233 



planting on ridges vs. beds, 227 



production, 203 



region suited to, 219 



seed, 214 



soils for, 220 . 

 Cow peas, 376, 420 



adaptations, 422 



classifications, 420 



culture, 422 



harvesting, 423 



insects and diseases, 424 

 Crimson clover, 414 

 Cropping systems, effects of, 33 



rotations, 34 



Crops, classification, origin and dis- 

 tribution, 1 



most important, 3 



number cultivated, 2 



Degeneration of potatoes, 266 

 Dent corn, 47 

 Diseases of alfalfa, 395 



corn, 88 



cotton, 235 



flax, 243 



oats, 170 



potatoes, 279 



sweet potatoes, 299 



timothy, 347 



tobacco, 479 



Distribution of forage crops, 303 

 Dodder on alfalfa, 395 

 Durra corn, 247 



Elements required for plant-growth, 5 

 Euchlsena Mexicana, 43 



