151 lines
4.3 KiB
Plaintext
151 lines
4.3 KiB
Plaintext
lree inrernal drainage aller years or eenlurres ol
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grazing Thus, we use mmblllmhve energy only when
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ii is appnipriuie
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Sod eondirioning can be sequeruial, allowing a year
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oelween riearrnenls, or alluiaanee ai 15 em or so, in
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order in prepare liar me snap planred iininedialely l-he
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nine ro uae implemenls is alsocrlliul, and early spring
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oral lne end ol a genile rainy period i. deal, as ihe soil
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is nor lhen bmugM up in lhe surlaee as dry elods, nur
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mllipses bad. as being [on wel.
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film is only one rule in ihe pniirrn ul inis sen ol
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ploughing and lhar is lo drive me iraclor or ieuiri
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sllghlly downhill, making hrmngrbmuts ol lhe land
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llie spines are ihe valleys and ihr i-ilas slope am and
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downsslape irigure 3.12» The soil (hannels, many
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hundreds oi inem, ihus beeome ilie easiesr way lor
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waler ro move, and ii mnvri oiil lioin lhe valleys and
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below lhe surlaee 0! me soil neeause ihe surlaee is
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lime disturbed, rools hold againsr erosion euen alier
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lresli ehisel ploughing, warer snaks in and lile
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preeesees are speeded up A piur ol ‘1 eon aned
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by iliis proeesslsillusnaied by Figure 6.11
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There is nu poinl in going more man In em in fuel
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rruunenl, and lo lsu erii in subsequenr riearmenls
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The rears ul planrs, nourished by warmlli and air, will
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men peneiraie rn an em or so an in pasniie. more in
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loiesls For disposal oi masslve sewage Waslrwim,
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Yeomansm reeommends ripping m 91] em or i 5 mi
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usirig deepmokd lrees ur legumes id lake up wasles
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l have scarcely seen a pmperry lhai would nol
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penellr by soil conduioning as a liisl siep ueluie any
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lurrne pul Paslure and snap do nol go om oi
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prodluuon as iney do underprieearln ploughing wilh
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eanveniiianal lmls, and lie lile pnxesses suller very
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liiileinierrupeiun
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in small gardens, lhe aer
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iwo ways‘
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- By drivmg in a lurk and levering genfly. llien
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ieinuring ii.
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- By lrueksurlaeesneei-iniilch, worms do lne work
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To summarise briefly, ilie resulls pl soil xthiblll-
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valinn are as lulliiws-
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. Lirrng soil: earrhworms add alkaline manure and
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ael as livrng plungers, suelung down air and nenee
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niuugen,
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- Frlable and open soil inrough which waler
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penelrares easlly as weak carbonie and heroic arid,
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lreeing soil elernenls lor planis, and dullering pH
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elianges;
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. Aeraled soil, which stays warmer in winler and
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eaoler in summer,
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. The absorber-l sml iiaell l‘ a giear walelwmlamlng
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blankel, pieuenring runell and rapid euaporanon lo
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iii. a maul malerial soalrs up niglil inoisluie lor larer
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use
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r. ellzd is nblalned in
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mead rools as planl and animal loud, making
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more air spaeas and lunnels in lhe soil, and [hung
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iuiiogeri is pan ul lhe deooiriposinon eyele,
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- Easy naur peneiralion nl new planlings, wheiher
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inase are annual iir perennial enips, and
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. a perinaiieni enange in rhe so il is nol again
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lrmlden, rolled, pounded, ploughed or enemiealised
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inln - lessness
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trees, nl eoirrse. ael as |mlgr|eml iir inbuili nulrienl
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pump, laying down lheir minerals as leaves and bark
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on ihe wll, where lungi and soil erusiarea mike lhe
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leaves inrri humus
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8.19
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SOILS IN HOUSE FOUNDATIONS
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soils eause perhaps 60-80% ol all house cricki and
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Insuraurr dnims lor laulry eunsirueiiun and "In:
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damage" About 2th nl lhe soils we build on will
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subside or heave depending on waler eonienl.
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Speeirienlly. blatk eraeking elay, suriaee clnys, and
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red—brawn clay learns are suliieel (o swelling and
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snrmlung, Sohd slone and buck houses are mosi
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sulneei ro slruerural lailure, wiih wood—mine and
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veneer less so
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Over i-ngaiian ol gardens, causing llae warer ialale
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to rise, isa primary cause olsiiil swelling The removal
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ol liees assisls lliis plocess, as do paved areas, and
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purse or lea rig sewage and waler pipes Some
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nulonous w or yellow chys collapse as darn walls
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when welled. H is as well lo eprisuli your local soil
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expen lar large eonslruellons as irials can lie
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expensive
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while lhe elleels are mpsi norieed lo 2 ni deep,
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pm iii in in deep need ro be moniiored lor ymInd-
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waler levels Sells subside and shrink wrlh exeessire
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drying lroo many irees rod near rhe houael and swell
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and heave willi exeessive walering and no lrees
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Adelaide lAiisrralial is an area where rnusr damaged
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houses are on Hicksml elays, our several anner areas
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also suller lliese ellesis, end in some. large buildings
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need no he ouill on loundaiioiis Capping deep piles lio
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FILES SUMK mm WAYER 'ABLE 0R EEDRODK
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lumilise nous. luumanrnsinsuuunuclay sails
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121
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