INDEX 



431 



Harrow, spading, 149 



spike-tooth, 145, 146 



spring-tooth, 147, 148 

 Hay an exhausting crop, 313 



salt, 65 



Heat, effect on rock, 6 

 Hoes, scuffle, 184 



styles of blades, 182 



wheel, 184 

 Hoeing, good and poor, 181 



purpose of, 179 



to kill weeds, 180 



Hog manure, plant food value, 349 

 Horses, heavy vs. light for plowing, 



128 



Horse manure, value of, 349 

 How deep to cultivate, 166, 168 

 How often to cultivate, 165 

 How plants drink, 77 

 Humus, 53 



enables soil to hold moisture, 

 328 



increases water capacity of 

 soils, 83 



darkens the soil, 35 



test for, 72 



value of, 8, 83, 92 



Ice has made soil, 11 



Idaho, rotation in, 407 



Idle land unprofitable, 332 



Illinois, rotation in, 407 



Improvident farming, 343 



Indiana, rotation in, 407 



Infertility caused by poor texture, 

 283 



Influence of sun on soil, 34 



Inoculating with old soil, 334 

 artificial cultures, 334 



Inoculation of soils, bacterial, 40, 

 43, 334 



Insect pests, control of, 303 



Iowa, rotation in, 408 



Irrigation, alfalfa, 271 



afternoon best time for, 269 

 by well and spring water, 244 

 directing the flow, 269 

 extent of, 233 

 frequency and time of, 267 

 from artesian well, 244 

 hydrant water for, 244 

 in foreign countries, 233 

 in humid regions, 289, 242 

 in the East, 241 



Irrigation in United States, 233-236 

 market-garden, 241, 245 

 National aid in, 275 

 objects of, 236 

 of meadows, 271 

 orchard, 271 

 of small fruits, 273 

 of potatoes, 273, 

 pumping water for, 246 

 sources of water for, 244 

 supply of water for, 243 

 of tree fruits, 271 

 of vegetables, 274 

 when necessary, 237 

 winter, 268 



Japanese pea, value as a soil im- 

 prover, 841 

 Jointer, plow, 132 

 Joints of tile drains, 226 



Kainit, effect of, 403 



enriches manure, 357 

 source of and contents, 385 

 value of, 385 



Kansas, rotation in, 408 



Kentucky, rotation in, 408 



Land reclaimed by drainage, 231 

 enriched by irrigation, 237 

 Land plaster, as aid in saving 



manure, 357 



or gypsum, effect on soil, 402 

 for treating alkali soils, 402 

 Land, when to ridge, 169 

 Landside plow, 137 

 Legume, what it is, 329 



benefit poor soils most, 336 

 Leguminous plants renovate soil, 



330, 334 



Level culture, advantage of, 168 

 Level, home-made, to construct 213 

 how to use, 213 

 spirit, use of, 216 

 Lime and land plaster called indirect 



fertilisers, 399 



Lime, air-slaked, how used, 402 

 effect on light soil, 899 

 leachy soil, 399 

 clay soil, 399 

 how to apply, 401 

 water-slaKed best form to use 



on sour soils, 401 

 when to apply, 402 



