=Tillage=, stirring the soil.

=Transpiration=, the giving off of water from plants.

=Tubercle=, a small nodular growth on the roots of plants.

=Under drainage=, drainage from below.

=Vitality of seeds=, the ability of seeds to grow.

INDEX

  Acid phosphates, 196.

  Adobe soils, 30.

  After-cultivation, 158, 164.
    benefits from, 164.
    flat, 169.
    frequency of, 167.
    saves water, 164.
    shallow, 15, 167, 169.
    time for, 166.
    tools for, 167.

  Agencies active in making soils, 32.

  Agents, with which farmer works, 5.
    most important, 6.

  Agriculture, foundation facts and principles of, 22.

  Air, and the farmer, 5.
    in relation to germination, 72.
    necessary for root growth, 20.
    work of, in making soils, 36.

  Albuminoids in plants, 64, 66.

  Alfalfa or lucern, 68.
    roots, 13.
    soils, 29.

  Ammonia in fertilizers, 204, 205.
    in barn manures, 175.
    lost by fermentation, 175.
    sulphate of, 194.

  Analysis of plants, 163-166.
    of fertilizers, 203.

  Animals, 5.
    and the farmer, 5.
    dependent on plants, 6.
    work of, in making soils, 37.

  Annual plants, 125.

  Anthers, 129.

  Aphis, 116.

  Apple, flower of, 129, 130.

  Ash in plants, 65, 66.

  Ashes, a source of potash, 199.
    cotton hull, 199.

  Bacteria, 68, 143.
    and the farmer, 5, 144.
    denitrifying, 144.
    in manures, 174.
    in the roots of legumes, 68.
    in the soil, 68, 143.
    nitrifying, 144.
    nitrogen-fixing, 144.

  Bare fallow, 100.
    when advisable, 100.

  Barn manures, 171.
    application of, 177.
    condition of, 179.
    effect of on soil texture, 172.
    loss of value of, 173.
    meaning of term, 173.

  Beet, 6.

  Beets, 4.
    nitrogen for, 214.

  Biological properties of a fertile soil, 143.

  Biology, 143.

  Blood, dried, 194.
    as a fertilizer, 194.
    nitrogen in, 194.

  Bokhara clover, 190.

  Bone, dissolved, 197.
    dust, 197.
    ground, 197.

  Bone fertilizers, 197.
    meal, 197.
    raw, 197.
    steamed, 197.

  Bone black, 197.
    dissolved, 198.

  Bones, 195, 197.

  Bordeaux mixture, 118.

  Breaking out the middles, 97.

  Brick, 30.

  Brush harrow, 102, 105.

  Buds, 120.

  Buildings, 5.
    and the farmer, 5.

  Bureau of soils, United States, 28. 
    Department of Agriculture, 28.