INDEX 



Abrasive effects of sand, 19 

 Absorbent capacity of soils, 95 

 Acid, phosphoric, forms of, 370 

 Acids secreted by plant roots, 9 

 Adaptability of soils, 24 

 Adobe soils, composition of, 63 



where found, 64 

 Air fertilises the soil, 37 

 Air, fertility in, 29, 87 

 Air in soils, 24 

 Alabama, rotation in, 405 

 Alfalfa, value as a soil improver, 340 

 Alkali soils, contents of, 66 



cost to reclaim, 67 



deep tillage for, 68 



deficient in nitrogen, 69 



how to treat, 67 



two types of, 66 

 Alluvial soils, 17, 48 

 Ammonia is not nitrogen, 369 

 Analyses of commercial fertilising 

 materials, 421^*22 



of farm manures, 422 

 Analysing soils at home, 71 

 Analysis of adobe soil from Santa Fe", 

 N. M., 417 



of loess from Dubuque, la., 

 417 



of soil from Yakima Co., 

 Wash., 418 



of swamp, soil in Carteret 



Co., N. C., 418 

 Angleworms, service of, 14 

 Animal excretions, value of, 316 

 Animals as soil builders, 12 



enrich soils, 21 



obstruct drains, 228 

 Ants as soil builders, 13 

 Arid land, cost of levelling, 267 



should be level, 266 



water needs of, 265 

 Arizona, rotation in, 405 

 Arkansas, rotation in, 405 

 Artesian wells, available for irriga 

 tiuii, 244 



Artificial fertilisers, are made of, 366 



growth of trade in, 365 

 Ashes, cotton hull, 384 



hardwood, 384 



lime-kiln, 384 



softwood, 384 



unleached, wood, 384 



use of, 62 



wood, for muck soils, 62 



Bacteria do not thrive on sour or 

 wet soils, 337 



each crop has different, 335 



in manure, 348 



in the soil, 40, 43, 334 

 Barley, temperature of soil for, 32 

 Beam wheel, plow, 133 

 Blood, dried, contents of, 378 

 Bogs, drainage of, 201 

 Breaks, how to construct, 293 



necessary to good farming, 294 

 Brush drag, 173 

 Burrowing animals soil builders, 13 



California, rotation in, 405 

 Capacity of soils to hold water, 80, 93 

 Capillary action, 89, 96 

 Catch crops, how to use, 331 

 Chemical changes in the soil, 44 

 Chemical vs. mechanical analysis, 



71 

 Clay, 52 



loams, 58 



test for, 72 



to separate from sand and 



silt, 73 

 Clay soils are cold, 33 



composition of, 56 



crops for, 59 



needs of, 389 



properties of, 52 



treatment of, 57, 126 



value of, 57, 93 



Cleansing properties of commercial 

 fertilisers, 321 



427 



