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    Soil management 1956

    TXT

    [...]4

    Soil Structure .. . ..[...]i'.. 6'
    Soil Conditioners .[...]Polyelectrolytes
    Land Preporqtion
    Soil Fertility[...]mum Production-,.
    Check List
    Good Soil Mancaement,[...]
    [...]P-., (




    Soil frlanagement[...]University of Arizona, Tucson




    Your soil is "alive." Good man- Even on your own farm the soil
    agement makes it produce an has wide diff[...]Different soils call for
    Poor management makes a soil different treatment. The same
    tunproductive. soil may require different treat-
    Soil management deals with ment from year to year or from
    the way you handle your soil crop to crop.
    ,to produce crops. The main ob- You also must consider differ-
    jective of a soil-management pro- ences in economic conditions. A
    gram is to provide a permcnent 'soil management practice that is
    as well as a profitob[...]d ditions.
    plenty of plant food elements are Soil conditions are extremely
    necessary to meet these objec- complex. Blanket recommenda-
    tives. Included in good soil man- tions to cover the requirements of
    agement a[...]ere are, however, certain
    the wise use of soil amend- basic principles you must consid-
    -with
    ments and commercial fertilizers er in planning any soil manage-
    r,vhere needed.[...]
    [...]on- much smallcr. Easy entrancc of
    ditions of a soil rvhich affect rvater, air, and plant roots is lost.
    plant grorvth. Your soil, to have Soil structure has been destroyed.
    good tilth, must have both good Soil structure may be compar-
    physical condition and a[...]cned l.ogether. Properly designed,
    Soil Structure constructed, and[...]lect in design, construction,
    etration, efficient soil aeration, oi: maintenance rvill cause the
    and sat[...]ridge to fail. Its collapse under
    pendent on good soil structure. a heavily loaded btts lvould be a[...]icles in the Skilled engineers design and
    soil. In nearly all soils, the parti- I:uild struct[...]e in
    Soils having good structure are your soil. The structure you build
    granular (grainy). The p[...]of rvater and air your management of the soil.
    in the soil is good. You maintain Your building materials are the
    good structure only by regular soil particles. On close examinat-
    care of your soil. ion you will find that these parti-
    Water and air enter the soil cles are of different sizes and
    through s[...]in the ishapes. Gravel and sand are the
    soil. These are formed by the par- Iargest partic[...]d their granulation. A readily enter into soil structure.
    network of connected passages is[...]inary microscope. Their behavi-
    determined by (1) soil texture or in the soil is like flour. Silt
    (particle size), and (2) str[...]ure, but is an important building
    means that a soil has large rnaterial when combined wit[...]d air. Clay is the smallest soil parti-
    Excessive or long continued cl[...]of Ecopes. It is the most active build-
    the soil to absorb water. The soil ing material that you as a farmer-
    "runs together" or becomes dis- engineer use in building soil
    persed, and the pores become St[...]
    You build soil structure by fast- Orgonic mctter turnover antl
    ening together these soil particles proper tillage are trvo main fae-
    int[...]aining
    shape, and arrangement of these good soil structure.
    granules are determined by the
    nature[...]o, too,
    rclatively few granules, causing must the soil granttles be fastenecl
    pore space to be so small[...]yott
    prcciable amounts of clay form return to the soil each year.
    granules readily when properly Soil organic matter is the Par-
    managed. This permit[...]lants
    trance of water and air. If im- and of soil organisms. The soil on
    properly managed, they "run to- your farm cont[...]intqin
    good soil tilth.[...]
    [...]how your
    dle west, this is but one-twentieth soil measures up to it is an indi-
    as mucli. So small an amount of cation of your soil-management
    organic matter, however, can[...]owth in You can maintain satisfactory
    your soil. supplies of organic[...]1. Return all crop residues to
    its influence on soil structure. Its the soil and plow them under.
    value to you as a soil conditioner Crop residues are the main sourc[...]hem only if insect or dis-
    binding agent holding soil parti- ease control requires it.
    cles, gran[...]o good if you have hard spots in a
    reduces soil erosion. field.
    Soil organic matter is the store-
    house for most or al[...]3. Grow and plow under
    gen found in your soil. It also green-manure crops. Some of
    stor[...]ually feeding of the poor physical condition.
    soil organisms. This releases the
    plant food elements[...]design and construct-
    Organic matter in your soil is ion in a bridge will not prevent its
    cons[...]ou in increasing production structure of your soil also breaks
    can only take place when it is de-[...]o
    especially true in southern Ari- provide soil conditions favorable
    zona where high temperatures[...]lled organic mqtter 1. Loosening the soil to im-
    turnover in soil management. Or- prove water penetra[...]
    3. Preparing a seedbed. 1. Till your soil only at the
    4.[...]g it too dry causes pow-
    time, tillage makes your soil a ,dering or loss of structure.
    better home for c[...]using special prac-
    plants). It helps to keep the soil tices, be sure your soil needs
    in good tilth. Too much tillage, them. Some[...]hand) may pulver- plowing, ripping, etc.
    ize your soil-severely restricting There are several tilla[...]for the correction of specific con-
    layers in the soil until roots and .ditions. Some of these practices[...]water.. Experi- surface soil and
    the deep[...]dom be profitable if your soil is
    Weeds require water for their
    grou,th. You[...]maintain have formed as a result of tillage,
    good soil tilth: irrigation or harvesti[...]tions.
    1. Work your soil only enough commonly Such a condition is quit[...]tc. the soil below the[...]
    [...]wers your net returns.

    satisfactory when the soil is dry Soil Conditioners
    and will fracture widely. Poor tilth in your soil may be
    caus[...]to break up hardpan or Materials sometimes called soil
    plowpan layers in the plow layer. conditioner[...]is one of your best soil condition-[...]
    [...]Since there are few acid soils
    step in improving soil structure in Arizona, very little lime is
    or tilth. needed for soil conditioning. In
    Many chemicals are also used fact, practically all of the irrigat-
    as soil conditioners. Some of the ed lands in t[...]
    [...]ium attached to the clay par-
    the unfavorable soil conditions ticles. These particles then tend
    associated with soil acidity in to group together so that larger
    a[...]lkali soils have too much so- cal analysis of the soil helps de-
    dium attached to the surface of ter[...]This causes a ed and, if so, how much should
    soil to disperse or run together be applied.
    and results in high alkalinity and Adding gypsum to your soil is
    stickiness, thus decreasing the[...]
    [...]equal value as a soil conditioner
    so that the salts can be leach-
    ed be[...]Other Sulfur Materiqls
    and disked into the soil or applied
    in the irrigation water.[...]etimes
    applied to leach out excess salts. used as soil conditioners. Nearly[...]ate found in the soil.
    The quality of irrigation water For maximum benefit in soil
    that is relatively low in total reclamation using[...]is page L0).
    prevents a build-up of sodium in
    the soil, and may in some instan- Polyelectrolites
    ces improve the rate of water
    penetration into the soil. A group of synthetic organic[...]-
    iduced as soil conditioners. Used
    Sulfur furnishes calcium to the properly these materials tend to
    soil indirectly. Through chemical ,stabilize the aggregates in almost
    reaction with calcium it forms any type of soil. They are proba-
    calcium sulfate or gypsum.[...]It is obvious that sulfur should a fine textured soil.
    not be used as a soil conditioner At present, however, their use
    if your soil does not contain cal- is restricted due to the high cost
    cium carbonate. A simple soil test of materials.
    will tell you whether or not c[...]ot One of the first requirements
    you need a soil amendment on for successful crop production is
    your soil. an abundant s[...]
    [...]pene- Deep cuts should
    tration in the soil. It increases in shallorv soils be<
    crop yields, helps reduce your soil must be left in al
    losses in u,ater and plant foo[...]in plant growth are quite obvious
    blems in soil manasement that in newly leveled la[...]veling op( a ic matter and soil organisms has
    thorough investigatio 1Sl be been dispiaced and deposited in
    made of your soil. 1 he of the lorver spots[...]
    [...]great influence on the
    of organic matter into the soil. length of time required to bring
    Where[...]equal to the other fields in the
    due to improved soil aeration area.
    rvhich follows. Liber[...]le on the subject of leveling
    The use of good soil-building Iand.[...]eral already present.
    nutrients from the soil. These
    mineral nutrients, commonly[...]ogen
    additional plant food. Other soild, Soil nitrogen is nearly all in
    deficient in one or mor[...]All soils require good crop ro- Arizona soil, except when leg-
    tation, and the intellig[...]
    [...]. As an example, since le-
    ply of nitrogen in the soil. Thus gumes are heavy users of phos-
    les[...]
    [...]rops grown in Arizona soils essential to maintain soil pro-
    have not shown any shortage of ductivity at[...]mes not available to plants, 1. Improves soil tilth by main-
    however, due to the alkalin[...]
    [...]ted following cotton in the
    the upper few feet of soil and fall and plowed under in time for
    help you to maintain good soil cotton to be planted again the fol-
    titth.[...]
    [...]e into the
    Fertilizers soil immediately ahead of anoth-
    ln The Rototion[...]e various plant- nitrogen. When this happens, soil
    food elements, and in their ability bacteria t[...]ents from the organic materials are competing
    soil. Also, crops follorving alfalfa with the[...]
    [...]Control of weeds.
    As an example, many soil and
    plant problems may be largly due Control[...]e
    brought on by poor air or water
    movement in the soil. Efficient mcrketing
    The eviden[...]uite possi-
    bly be considered more important
    as a soil conditioner than as a Moximum Production
    storehouse of plant food. Good In outlining a good soil and
    management of this organic mat- crop manageme[...]principles
    Eflicient lrrigction. of soil management presented in
    (See Circula[...]
    [...]eck List for
    Good Soil Monogement
    y' L[...]ood tilth of your
    soil by proper organic matter[...]r,eeds.

    r' Use soil conditionels if You[...]DEMONSTRATf0N AGEM for r/ Relate your soil manage-
    othen farm and me[...]

    MD

    Soil management--Arizona