386 



INDEX 



Calcium, defined, 30, 31 



amount removed by crops, 62, 63 

 amount removed by fruit, 69 

 and protein relations, 64 

 function of, in plants, ">"> 

 how distributed in plants, 63 

 Capillary rise of water, 96 



factors influencing, 96, 97 

 how aided, 102 

 laboratory exercises on, 105 

 water, denned, 93 



importance of, 93 

 how held by soil, 93 

 Carbon, defined, 30, 32 

 dioxide, defined, 6 

 function of, in plants, 55 

 how plants secure, 35, 36 

 much used by plants, 36 

 Carbonate of lime, defined, 41 

 deposit of, 239 

 for liming, 238 

 laboratory exercises on, 251 

 origin of, 41 

 test for, 238 

 Carbohydrates, defined, 57 



and potassium relations, 64 

 laboratory exercises on, 57 

 Catch crops, defined, 174 



value and uses of, 193, 272 

 Chalk, natural, 243 

 Chemical analysis of soils, 30, 356 

 has limitations, 355 

 uses and value of, 257, 258 

 changes in soils, 6 

 composition, of animals, 36 

 plants, 36 

 soil, 29, 30 

 elements, defined, 29 



how exist in soil, 30 

 formula, defined, 30 

 symbol, defined, 30 

 test for carbonates, 238 

 for soil acidity, 234 

 Chloride of potash, fertilizer, 202 

 Chlorophyll defined, 50 

 Cherries, elements removed by, 69 

 Classification of soils, 14 

 on basis of origin, 15 

 of texture, 14 

 of type, 22 



Clay, defined, 11, 12, 14 

 advantages of, 321 

 clearing, 324 

 crops to grow, 325 

 drainage in, 322 

 erosion problem in, 324 

 field studies on, 326 

 home projects on, 326 

 loam, defined, 14 



mechanical composition of, 14. 15, 321 

 lime, use of in, 323 

 nitrogen problem in, 323 

 organic matter problem in, 323 

 particles, defined, 11, 12 

 phosphates in, 324 

 plowing in, 325 

 plowing of, 15, 142, 325 

 rotations for, 325 

 soil class, 14 

 soil management, 321, 325 

 special problems in, 321 

 sweet clover for, 323 

 tilth (good) in, 322 

 types of farming, 325 

 true, 41 



Climate, arid, defined, 44 

 effect of, on soil, 42 

 humid, defined, 42 

 relation to fertility, 80 

 semi-arid, defined, 44 

 sub-humid, defined, 42 

 Clod crushers, 154, 155 

 Clover, adaptation of, 275 



elements removed by, 62 

 for green manuring, 191, 193 

 maintaining farming, 177, 191 

 marsh lands, 304 

 sand farming, 316 

 good, a weed-killer, 78, 268 

 sod better than timothy, 181 

 where grown, 275 

 Club root of cabbage, 233, 258, 259 

 Colluvial soil, defined, 15 



origin and value of, 22 

 Commercial fertilizers. (See Fertilizers'* 

 Complete fertilizers, defined, 205 



determining equivalent of, 198, 202 

 expressing equivalent of, 205 

 use of, 205, 206 

 Composition of feeds, 383 

 soil, 11, 29, 30 

 influences plant growth, 34 

 Conservation of soil moisture, 100-105 

 in sand farming, 313 

 laboratory exercises on, 105, 106 

 Continuous cropping defined, 264 

 Coral, as agricultural lime, 243 

 Corn, cultivation of, 162 



elements removed by, 62 

 for sands, 316 

 home projects on, 169 

 on peat soils, 125, 187, 201, 204 

 production on decline, 1 

 response to fertilizers, 200, 201, 206-208 

 root development of, 53, 68 

 root-worm and fertility, 255 

 rotations for, 275-280 

 where grown, 279 

 Corrugated roller, 155 

 Cost of fertilizers, an expense, 372 

 Cotton, elements removed by, 62 

 for sand farming, 317 

 rotations for, 279, 280 

 where grown, 279 

 Cottonseed meal, fertilizer, 196, 197 

 availability of, 196 

 relation to decay, 173 

 Coulters, 141 

 Cover crops, 193, 272 



for soil erosion, 288 

 Cowpeas, illustrated, 191 



elements removed by, 62 

 for green manuring, 191, 192 

 Crimson clover, illustrated, 192 

 for green manuring, 191, 192 

 for sands, 316 



Crop production, and fertilizer practice, 369 

 determines fertilizer use, 369" 

 relation between cost of, and 



profits, 375 

 profitable, 369-376 



the farmers' problem, 370 

 rotation, defined, 263 



alfalfa in, 329, 331, 339, 340 



application of principles, 332, 342 



best for soil improvement, 274 



benefits of, 264, 270 



chart, 331 



controls insects and diseases, 264 



cropping problems solved by, 329 



