428 



INDEX 



Clevis, plow, 133 



Clover, crimson, a soil improver, 340 

 red, is best green-manuring 



crop, 338 



red, when to sow, 338 

 temperature of soil for, 32 



Cold, effect on rock, 6 



Cold soil, drainage helps, 33 



Colorado, rotation in, 406 



Commercial fertilisers, 364 



a poor soil improver, 345 

 are made of, 366 

 when to apply, 395 



Composition of soils, 51 



Conglomerates, 5 



Connecticut, rotation in, 406 



Cottonseed meal, contents of, 378 



Coulter, disk and knife, 132 



Cover crop adds humus to soil, 331 

 how to use, 331 

 checks erosion, 293 

 use in fruit growing, 331 



Cow manure, plant food value, 

 349 



Cowpea, value as catch crop, 339 

 value as soil improver, 339 



Crimson clover a valuable soil im- 

 prover, 340 



Crop alternation in U. S., examples 

 of, 307-310, 319 



Cropping impairs fertility, 312 



Crop rotation checks "club-foot," 



303 



fungous diseases, 304 

 insect and disease injury, 303 

 potato scab, 303 

 weediness, 302 



Crop rotation for "Corn Belt," 



308, 310 



for dairy farm, 308, 309 

 for hay and grains, 310 

 why beneficial, 800 



Crop rotations practised in different 

 states, 407-419 



Crops, catch and cover, how to use, 



331 



choosing for a rotation, 305 

 clovers, including all legumes, 

 ' need of, 393 

 cotton, needs of, 394 

 different rooting habits of, 



301 



early, best slope for, 34 

 forage, need of, 393 



Crops, for loam soils, 59 



for sandy loams, 55 



for sandy soils, 54 



for sour soils, 401 



fruit, needs of, 394 



gradual decrease in yield, 285 

 due to exhaustion of 

 soluble plant food, 286 



how often to irrigate, 268 



Indian corn, needs of, 393 



market garden, needs of, 394 



needs of different, 392 

 learned by study 393 



root and tuber crops, needs 

 of, 394 



rotation, a law of Nature, 300 



rotation of, 299 



sweet and Irish potatoes, needs 



of, 394 

 Cultivate, how often, 165 



how deep, 166 

 Cultivating, 142 



to kill weeds, 157 

 Cultivation to save water, 163 

 Cultivators, broad-tooth, assist ero- 

 sion, 295 



called "horse hoes," 152 



definition of, 152 



hand, 183 



shovel-tooth, or coulter, 153 



spike-tooth, 153, 184 



spring-tooth, 154 

 Cultivators, sulky, 155 



types and use of, 144, 152-156 : 

 Culture, level, advantage of, 168 



Dairy farm rotation, 308, 309 

 Delaware, rotation in, 406 

 Deodoriser, soil is a, 39 

 Disk plow, 139 

 Ditch digging, 224 



tools used for, 224 

 Ditches, cement-lined, 252 



cost of filling, 229 



fix grade and depth, 203, 214- 



how to dig, 202, 224 



open, 200, 202 



when practicable, 201 



how to fill, 226 

 Ditching spade, 225 

 Diversified farming, 315 

 Diversity of soils, 49 

 Do plants excrete? 318 

 Draft in plowing, 127 



