388 



INDEX 



Dried blood fertUizer. 196, 197 



DriU application of fertilizers, 201, 206-208 



Droughty soil, 99 



Dry-climate soil, 377 



Dry-land farming, defined, 377 



crops for, 277, 378 



crop rotations for, 277, 381 



cultural methods in, 380 



dairying in, 381 



extent of dry-farm lands, 377 



farming methods in, 378 



fertilizers for, ^ 381 



good farming in, 381 



fisting for, 159 



moisture conservation in, 380 



planting and seeding in, 380 



plowing in, 380 



plows for, 380 



projects (student) in, 381 



rainfall in, 377 



seeding and planting in, 380 



soils best for, 378 



stock raising in, 381 



water problem in, 92, 377 



water requirement in, 91 

 Dune sand, 309 

 "Dust" of the earth, 36 

 Dynamiting soils, 148 



Earth, formative period of, 5 

 Elements, defined, 29 



amount removed by crops, 61-63 



conserved by rotation, 267 



contained in subsoil, 72 



distribution of, in crops, 63 



exchange of, in farming, 350 



forms in which plants secure, 61 



function of, in plants, 55 



how exist in soil, 30 



how plants secure, 36, 54 



laboratory exercises on, 58 



made available by liming, 230 



minerals, ^defined, 33 



pass through cycles, 37 



plant-food, defined, 54 



removed by fruit, 69 



required by plants, 35 



source of, for plants, 35 



supply of, in soil, 33 



why some soils are deficient in, 40 

 (See under Plant-food elements) 

 Erosion. (See Soil erosion) 

 Experiment Station fertilizer tests, 362 

 Experimental fertilizer plots, 360-368 

 Exportation on decline, 1 



Fall plo-vving, 144 



retarded nitrification, 357 

 Farm crops consumed in U. S., 1 

 Farm management, 327 



and crop rotations, 327-338 

 crop rotation chart aids in, 331 

 drainage relations, 112 

 soil problems common in, 327 

 successful, 327 



systematized by rotation, 328, 341 

 Farmer's business, 37 

 Farmers conduct fertilizer tests, 362 

 Farm soil examination, 368 



survey, 368 

 Farming, account with plant-food elements 

 in, 347-353 

 clay lands, 325 

 for, profit, 369-376 

 grain, and soil depletion, 344 



Farming, gram, revised, 344 



and stock, combined, 347 

 vs stock, 343, 346 

 in irrigated sections, 131 

 in regions of little rainfall, 377 

 in relation to soil fertility, 343 

 marsh lands, 293-307 

 N and P balance in, 347-353 

 sandy soils, 309-319 



types of, 318 

 stock, and fertility, 345 

 is popular, 345 

 vs. gram, 343, 346 

 sj'stoms of, 343 

 trials in Illinois, 347 

 in Ohio, 345, 346 

 Feeding of crops, 61, 63 

 power of plants, 66 

 stock, elements lost in, 350, 351 

 Feeds, fertilizing constituents in, 383 



nutrient composition of, 383 

 Feldspar, defined, 40 

 Fertile soil, defined, 75 



factors determining, 75 

 Fertility. (See Soil fertility) 

 Fertilization, defined, 190 

 and liming, 231 

 by alluvial deposits, 18 

 Fertilizer, attachments, 212 

 cost of, an expense, 372 

 practice and profits, 369 



law of diminishing returns in, 374 

 of the minimum in, 373 

 tests, 07, 204, 223, 360-368 



how experiment stations conduct, 



363 

 how farmers can conduct, 362 

 in general, 360-373 

 on marsh soils, 200, 201, 204, 298, 



300, 303 

 points to observe, 366 

 value of untreated plot, 370 

 Fertilizers, 196-213 



absorption of, by soil, 213 

 amount to apply, 211, 299, 312-313, 324 

 broadcast vs hill application, 213 

 chemical analysis to tell need of, 355 

 classes of, 196 

 commercial, defined, 196 

 computing profits from, 372 

 cost of, 207 



determined by soil and crop, 208 

 determining profits from, 371 

 diagnosing soils for need of, 355 

 drill and hill application of, 211-213 

 economic laws in relation to, 373 

 effect of lime on, 230 

 eflSciency of, increased by green 

 manure, 209 

 liming, 230, 231 

 moisture in soil, 205 

 organic matter, 173 

 fertility and fertilizer relations, 206 

 for marsh soils, 297-300 

 for peat soils, 297, 303 

 for sands, 311-313 

 green manuring helps, 209 

 nigh grade vs. low grade, 210 

 hill and drill application of, 211-213 

 home mixing of, 210 



projects on, 225, 376 

 how elements in, expressed 196 

 to apply, 211-313 

 to determine need of, 355-368 

 indirect, 196 



