INDEX 



Absorption of water by seeds, 49 

 favored by contact, 49 

 retarded by salts, 49 

 Acid phosphate fertilizer, 197, 199 

 absorption by soil, 213 

 acid character of, 224 

 application of, 199, 299, 312, 324 

 availability of, 197 

 choice of, 201, 202 

 mixed with other materials, 211 

 on acid soil, 202 

 vs. rock phosphate, 202 

 soils, extent of, 236 

 how to tell, 233 

 lime for, 231 

 on limestone, 242, 248 

 Acidity of soils. (See Soil acidity) 

 Acre profits from fertilizers, 372 

 Air, for soil medium, 13 



source of carbon, 13 

 Agricultural lime, defined, 229 



comparative value of, 244 

 kinds of, 238-244 

 laboratory exercises on, 252 

 source of, 154 

 testing value of, 232, 362 

 Alfalfa a heavy feeder, 65 



amount elements removed by, 62 

 and crop rotation, 329, 339, 340 

 for sands, 316 



good as a weed-killer, 78, 268 

 inoculation for, 230 

 lime for, 230-232 

 needs much potassium, 203 

 on acid soils, 231, 232, 249 

 rich in calcium (lime), 64 

 rich in protein, 64 

 root system of, 68 

 rotations for, 276, 277 

 when successful on acid soils, 249 

 where grown, 275 

 Alkali in soil, injurious, 258 

 soil, defined, 43, 44 



deep rooted plants for, 259 

 drainage for, 259 

 management of, 260 

 spots, 44 



remedy in drainage, 111 

 Alluvial soil, defined, 15 



origin and value of, 17 

 Alsace, potash in, 202 

 Alsike clover, adaptation, 275 



elements removed by, 62 

 response to liming, 233 

 Alumina, defined, 30, 31 

 Aluminum, defined, 30, 31 

 Ammonia gas, defined, 174 



in horse stable, 224 

 Ammonium sulfate fertilizer, 196 

 Analyzing soils, 355-368 



for lime needs, 358 

 for nitrogen needs, 359 

 for organic matter, 359 

 for phosphorus needs, 359 

 for potassium needs, 360 

 methods of, 358 

 Apatite, defined, 40 



25 



Aphids and yields, 256, 258 



Apples, elements removed by, 69 



Arid climate, defined, 44 



soil, characteristics of, 44, 378 



Availability of elements, defined, 54 

 affected by iron in soil, 262 

 of nitrogen fertilizers, 196 

 of phosphate fertilizers, 197 

 of potash fertilizers, 202 

 of, vs. total amount, 199, 356 



Bacteria and crop failure, 181 



are plants, 178 



for soil medium, 13 



in soil, 171-2 



legume, 172, 180 



nitrogen-gathering, 172, 175 



number of in manure, 216 

 soil, 13, 171 



size of, 171 



Backfurrow, 113, 139, 148 

 Barley, elements removed by, 62 



for sands, 317 



response to liming, 233 



rotations for, 275, 276, 280 

 Barnyard manure. (See Manure) 



water, why colored, 224 

 Basic slag fertilizer, 197, 198 



availability of, 197 

 choice of, 202 

 Basalt, defined, 39 

 Beans, where grown, 281 

 Bench terraces, defined, 289 

 Beet, sugar, elements removed by, 62 



root system of, 68 



(See under Sugar beets) 

 Black alkali, defined, 44 

 Blank test plots, 360 

 Blinding tile, defined, 1 19 

 Blood meal fertilizer, 196, 197 



availability of, 196 



in relation to decay, 173 

 Blue grass, elements removed by, 62 



litmus paper, 229 

 Bog cutter, 297 



"Bogus" spots in marsh soils, 302 

 Bone meal, fertilizer, 197, 198 



availability of, 197 



choice of, 201 

 Broadcast grain sower, 158 

 Brome grass for sands, 317 

 Buckwheat, elements removed by, 62 



for green manuring, 66, 192, 194 



for sands, 317 



rotations for, 278 

 Burnt lime for peat, 245 



for soils, 243 

 Business of the farmer, 37 



Cabbage, a heavy feeder, 64 

 club root of, 233, 257, 259 

 elements removed by, 62, 68, 203 

 resistance to yellows, 258, 260 

 response to liming, 233 

 root system of, 68 

 yellows and fertility, 257, 260 



Calcite, defined, 40 



385 



