lree inrernal drainage aller years or eenlurres ol
grazing Thus, we use mmblllmhve energy only when
ii is appnipriuie

Sod eondirioning can be sequeruial, allowing a year
oelween riearrnenls, or alluiaanee ai 15 em or so, in
order in prepare liar me snap planred iininedialely l-he
nine ro uae implemenls is alsocrlliul, and early spring
oral lne end ol a genile rainy period i. deal, as ihe soil
is nor lhen bmugM up in lhe surlaee as dry elods, nur
mllipses bad. as being [on wel.

film is only one rule in ihe pniirrn ul inis sen ol
ploughing and lhar is lo drive me iraclor or ieuiri
sllghlly downhill, making hrmngrbmuts ol lhe land
llie spines are ihe valleys and ihr i-ilas slope am and
downsslape irigure 3.12» The soil (hannels, many
hundreds oi inem, ihus beeome ilie easiesr way lor
waler ro move, and ii mnvri oiil lioin lhe valleys and
below lhe surlaee 0! me soil neeause ihe surlaee is
lime disturbed, rools hold againsr erosion euen alier
lresli ehisel ploughing, warer snaks in and lile
preeesees are speeded up A piur ol ‘1 eon aned
by iliis proeesslsillusnaied by Figure 6.11

There is nu poinl in going more man In em in fuel
rruunenl, and lo lsu erii in subsequenr riearmenls
The rears ul planrs, nourished by warmlli and air, will
men peneiraie rn an em or so an in pasniie. more in
loiesls For disposal oi masslve sewage Waslrwim,
Yeomansm reeommends ripping m 91] em or i 5 mi
usirig deepmokd lrees ur legumes id lake up wasles

l have scarcely seen a pmperry lhai would nol
penellr by soil conduioning as a liisl siep ueluie any
lurrne pul Paslure and snap do nol go om oi
prodluuon as iney do underprieearln ploughing wilh
eanveniiianal lmls, and lie lile pnxesses suller very
liiileinierrupeiun

in small gardens, lhe aer
iwo ways‘

- By drivmg in a lurk and levering genfly. llien
ieinuring ii.

- By lrueksurlaeesneei-iniilch, worms do lne work

To summarise briefly, ilie resulls pl soil xthiblll-
valinn are as lulliiws-

. Lirrng soil: earrhworms add alkaline manure and
ael as livrng plungers, suelung down air and nenee
niuugen,

- Frlable and open soil inrough which waler
penelrares easlly as weak carbonie and heroic arid,
lreeing soil elernenls lor planis, and dullering pH
elianges;

. Aeraled soil, which stays warmer in winler and
eaoler in summer,

. The absorber-l sml iiaell l‘ a giear walelwmlamlng
blankel, pieuenring runell and rapid euaporanon lo
iii. a maul malerial soalrs up niglil inoisluie lor larer
use

 

     

 

r. ellzd is nblalned in

 

 

mead rools as planl and animal loud, making
more air spaeas and lunnels in lhe soil, and [hung
iuiiogeri is pan ul lhe deooiriposinon eyele,

- Easy naur peneiralion nl new planlings, wheiher
inase are annual iir perennial enips, and

 

. a perinaiieni enange in rhe so il is nol again
lrmlden, rolled, pounded, ploughed or enemiealised
inln - lessness

trees, nl eoirrse. ael as |mlgr|eml iir inbuili nulrienl
pump, laying down lheir minerals as leaves and bark
on ihe wll, where lungi and soil erusiarea mike lhe
leaves inrri humus

   

8.19

SOILS IN HOUSE FOUNDATIONS

soils eause perhaps 60-80% ol all house cricki and
Insuraurr dnims lor laulry eunsirueiiun and "In:
damage" About 2th nl lhe soils we build on will
subside or heave depending on waler eonienl.
Speeirienlly. blatk eraeking elay, suriaee clnys, and
red—brawn clay learns are suliieel (o swelling and
snrmlung, Sohd slone and buck houses are mosi
sulneei ro slruerural lailure, wiih wood—mine and
veneer less so

Over i-ngaiian ol gardens, causing llae warer ialale
to rise, isa primary cause olsiiil swelling The removal
ol liees assisls lliis plocess, as do paved areas, and
purse or lea rig sewage and waler pipes Some
nulonous w or yellow chys collapse as darn walls
when welled. H is as well lo eprisuli your local soil
expen lar large eonslruellons as irials can lie
expensive

while lhe elleels are mpsi norieed lo 2 ni deep,
pm iii in in deep need ro be moniiored lor ymInd-
waler levels Sells subside and shrink wrlh exeessire
drying lroo many irees rod near rhe houael and swell
and heave willi exeessive walering and no lrees
Adelaide lAiisrralial is an area where rnusr damaged
houses are on Hicksml elays, our several anner areas
also suller lliese ellesis, end in some. large buildings
need no he ouill on loundaiioiis Capping deep piles lio

 

 

 

FILES SUMK mm WAYER 'ABLE 0R EEDRODK
lumilise nous. luumanrnsinsuuunuclay sails

 

 

 

121