434 



INDEX 



Plow, the modern, 116 



subsoil, 125 



sulky, 138 



swivel, 137 



trenching, 224 



when to, 134-136 

 Plowing, a soil cooler, 36 



deep, 121, 123, 124, 126 



deep, vs. shallow, 126 



draft in, 127 



fall, 134 



flat-furrow, 118 



for fruit trees, and root crop, 

 123 



heavy teams for, 128 



in heavy soils, 121 



in the South, 126 



lap-furrow, 119 



leguminous crop grown for, 

 329, 334 



objects and methods, 114-131 



overlapping-furrow, 118 



power for, 129 



rolling-furrow, 118 



spring, 135 



steam power, 130 



to drain soil, 122 



to establish a mulch. 122 

 Plowing under a green manure, 337 



when dispensed with, 136 

 Plows, adjustment of, 140 



various types of, 137 

 Potash, sources of, 384 

 Poultry manure, of highest value, 350 

 Power for plowing, 129 



electricity used, 130 



steam, 130 



Pumpkins, temperature of soil for, 32 

 Pumps for irrigating purposes, 246 



cost of, 248, 250 



hydraulic rams, 250 



steam and gasoline engines, 

 248 



water-wheels, 249 



windmills, 247 



Quantivalence of fertilisers, 370 

 Questioning the soil, 390 



by experiment with fertilisers, 

 390, 391 



Rainfall, general, map of, 2S6 

 insufficient, 78 

 soil storage of, 79 



Rainfall, supplies free water, 29 



unevenly distributed, 78 

 Rape a good soil improver, 342 

 Raw materials, actual mixing easily 

 done, 388 



cheaper to buy, 388 



mixing the, 387 



Reclamation Act of 1902, 243, 276 

 Reclamation of alkali soils, 67 

 Red clover excels as a soil improver, 



338 



Reducing and fining process cease- 

 less, 4 

 Reservoirs, for water storage, 248 



small, how to build, 245 

 Rhode Island, rotation in, 414 

 Ridging crops promotes erosion, 296 



land, 168 

 Rock becoming soil, 3, 27 



elements in, 27 



erosion of, 19 



split by roots and stems, 9 



weathering of, 3 

 Rollers, kinds and use, 177 

 Rolling, to assist germination, 171 



benefits of, 173-176 

 Roots, fertilising value of, 332 



plant, secrete acids, 9 



split rocks, 9 



Rotating crops, rules for, 305 

 Rotation, few systems of, in U. S., 

 307-310, 319 



for "Corn Belt," 308, 310 



for hay and grains, 310 



of sown and tilled crops, 303 



typical systems of, 307 

 Rotations practised in different 



states, 407-419 



Rye improves soil when plowed 

 under, 341 



Salt an indirect fertiliser to small 



extent, 399 

 Salt hay, 65 

 Salt, little used as fertiliser, 403 



marshes, drainage for, 65 

 marsh soils, 64 



how formed, 65 

 crops for, 65 

 Sand, 51 



abrasive effects of, 19 



dunes, 50 



test for, 72 



to separate from siltand clay ,73 



