INDEX 



387 



Crop rotation, definite, defined, 263 

 in practice, 263, 275 

 economic yields resulting from, 272 

 factors determining kind of, 32S 



proper, 272 

 farm management in i elation to, 



327 

 fertilizers do not take place of, 271 

 fertilizing elements conserved by, 2 

 field studies on, 282, 342 

 fixed, defined, 263 

 for all farms, 341 

 for clay soils, 325 

 for cotton, 336 

 for cowpeas, 338 

 for depleted silt loams, 326 

 for dry-land farming, 277 

 for gardening, 280, 281 

 for general farming, 331, 342 

 for marsh soils, 304 

 for North Atlantic States, 277 

 tor North Central States, 275 

 for Pacific States, 280 

 lor sandy soils, 317 

 for South Atlantic States, 27S 

 ior South Central States, 279 

 for stock farming, 329 

 lor truck farming, 280, 281 

 helps to maintain fertility, 268-270 

 home projects on, 282, 242 

 how to plan, 329 



for gram farming, 330 

 for stock farming, 330 

 for truck farming, 331 

 illustrated, 332-342 

 increases organic matter, 265, 274 

 legumes in, for best results, 272 

 liming problems solved by, 276 

 not always beneficial, 271 

 on hillsides, 2S8 

 other points on, 339 

 practical, 328 



problems, in illustrated, 332-342 

 remedy for diseased soil, 257 

 short better than long, 274 

 soil fertility in relation to, 263 

 soil problems solved by, 329 

 some systems of, 274 

 special, for alfalfa, 340 

 summary^ on practical, 341 

 systematizes farming, 32S, 341 

 tilth improved by, 266 

 to meet several soil problems, 338, 



341 

 weeds controlled by, 268 

 wheat yields increased by, 271 

 Crops, advantages in growing different, 327 



and soil determine fertilizer needs, 208 



as feeders, 61-63 



because of decay, 172 



benefited by limmg, 232, 233 



change of, not always beneficial, 271 



demanding much potassium, 203 



factors in growing, 75 



failure of, and bacteria, 181 



failure of, due to diseases, 257 



fertility indicators, 80 



for heavy clay soils, 325 



for marsh lands, 305 



for sands, 316 



grow, in right combinations, 272 

 order, 273 



grown, in dry-land farming, 277 

 in North Atlantic States, 277 

 in North Central States, 275 



Crops grown in Pacific States, 280 



in South Atlantic States, 278 

 m South Central States, 279 

 growth of, and hght, 77, 78 



and weeds, 78 

 increased by rotation, 268-271 

 injured by liming, 233 

 large, may not be most profitable, 369 

 plowing under, for green manure, 193 

 plow under or feed, 195 

 remove mmeial elements, 33, 62, 63 

 secret in growing, 86, 87 

 secure elements from two sources, 172 

 tolerating soil acidity, 233 

 vary in their requirements, 64 

 yields of, affe cted by temperature, 51 

 m England, 2 

 in France, 2 

 in Germany, 2 

 in United States, 2 

 relatively low, 2 

 Cultivation, defined, 161 



favors nitrification, 161, 174, 357 

 level vs. hilling, 167 

 objects of, 161 

 right time for, 164 

 shallow is be&t, 167 

 to conserve moisture, 162 

 Cultivators, 161, 166 

 Cultipacker, 155 



Culture solution, how to make, 58 

 Cumulose soil, defined, 15 



origin and extent of, 16 

 Cyhnder fertilizer tests, 360 



Diary farms, use of manure on, 221 



of fertilizers on, 222, 345, 353 

 Deadfurrow, defined, 113 

 Decay, and crops, 172 

 of rocks, 1-9 

 of soil, 9 ' 



organisms of, lacking, 175 

 Deep tilling, 147 

 Depleted soils, defined, 84 



improvement of, 326 

 Disk drills, 157 



harrows, 151 

 Disking, the seed bed, 151 



before plowing, 153 



for summer fallowing, 153 



potato land for grain, 153 



to conserve moisture, 153 



vs. plowing, 159 

 Disintegration of rocks, 1-9 

 Dolomite, defined, 40 

 Drag (harrow), 152 

 Drainage, defined, 109 



and percolation, 95 



benefits of, 109-112 



by means of pumps, 126 



erosion prevention, 287 



factor considered in fertility, 355 



field studies on, 133 



how accomplished, 112 



in day soil farming, 321 



laboratory exercises on, 132, 133 



lands needing, 112 



of alkali soils, 131, 258 



of marsh lands, 294 



noted projects, 126 



sub-surface, 113, 115, 117 



surface, 112, 114 



vertical, 113 



tile, 117-126. (See under Tile drainage) 



what determines method of, 113 



