146 lines
5.4 KiB
Plaintext
146 lines
5.4 KiB
Plaintext
'mnrwemng" problem, as do swales and rarsed beds
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wilh high edges lo W21" wales runelf. Sall problems
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ran somedines be solved by ilushrug beds wiih liesh
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waier, bui ii ihe sealer souree is iisell sally, salinily
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needs ihe rombined solulions ol humus produriioo,
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perhaps a poriding periud ol waier wnh algae
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produeiion and waier erop, iorile or disiillaiion
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oearmenis, and a ehoue ol nIklallrant rrop FR?
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dramang sands an be lmglud wllh sali levels rn waler
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much higher dun will lae ioleraled as spray irrigadon
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by plaian lid lsoll ppm),
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Desplle all ihese problems, we ean usually esloblish
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home gardens and adapied lree rrop sysiems, and
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many seleried areas lasperially riear searps, rivers, hills.
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or rinses) will grow exiellenl vegeiable, and iiee
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eiop won appropriale waler run—oil nanusnrig,
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Perhaps ihe mosi Impomnl lhing io remember sboui
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any aeriviiy iu deserr is |ha| ihe mmnl sysiems are
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lraglle Good mauageinenl arid eonsiani apprarsai is
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easeniial Small sysierns may be called lor, especially
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where mum)" is harvesled Namral yields should ire
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eareiully assessed, and broadseale or grand irials
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avoided unhl ihe eapaeily oi lhe ioial iyskmi
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eapeeialiy ol wakr .esoureesms assessed
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rareessive mineral rnnienl ln sol‘ or waier ran also be
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iome, bolh iu phnls and animals. dud in panarular lame
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waiers rnusi be iesied lnr lluorine. iudmm, and
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rddloadwes Nilraies are is be ngomnsly lesled more
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ehildren are consuming woler and garden lul
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produeis, and niirale lerriliser used or minimal levels,
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or nol or all in ihe absenre or muleh or high urgame soil
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sonieiil law. or more humusi
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Aluminium, boron, sodium, and manganese ran oern
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oversupply al very low or high pH values, and only
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humus ean nuller ihe “puke ol ihese mess minerals
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Aluminium in arid soil selunons damages reels, and
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high levels or manganese eauses siuuiing and
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yellowing in plauls a 5 ppm mppzr, or lo ppm lead or
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sine eao slop rpm growm Complouly ioradsluw and
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Chadwick, mm.
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A mmpkx soil nuirierii, esseniial (i) all planis lor
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growih and enzymes, is phosphorus ii readily beeeimes
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mmhlble in acid soils, romiuriing ihere wilkl iron or
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aluminium in ealeaieous soils I| lorms insoluble
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ealdum eompounds, in arid aieas phosphales ran be
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derieienl eurepl in humus. in iorasis, and in ihe sill ol
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ponds. Manure irons seed-eaiirrg birds has high
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phosphaie levels Corieei inorulaiion ol inirodueed
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planl speeies wnh phosphaiemobilising mymnhln
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may be esseniial lo (Ml! gmwth. Amrms, euealypas.
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legumes generally, pines, Casuunnos, and eveu garden
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erdps can beneiii hour ihe rooi arsomalm ihai enable
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iherr roois lo aeeramulale phosphorus irorn rho
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surrounding soil. thsphalls musl always be applied
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iusmallquarinrres, close io iherrup
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1raee elemenis lzlne, eopper) all be applied io sail
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las sulphaiesi, and 7 hg/ha ril bolh ll": arid eopper
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sulphaies added lo alkaline soulh Avslnfiin sosls
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enables pasrure gmwlh land lire earning rapariiy or
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shktp) |u inoease by a lunar ol m limes so g/ha ni
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molyodenum ln more aeid soils enables elover
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produeiron However, ix is also pessiole lo add
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mirronulrienis as lollar sprays, w rnluse lhem lnlo
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irrigailon waier al rool level, io iririude ihem iri
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slow—release pelleo ai idol Intel; or re max ihem in bulk
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soil amendmenls such as dolom . Over-supply oi
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mes sarne nulrieula will resule ln mldty and healih
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problems No amounl ol guesswork ean supplanl
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rarelul and skilled sorl analyses. Flam lissue lroin
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heallhy garden plarils should analyse aboui as ln Table
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I‘LL
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MINERAL SOLUBILITY AND pl-l,
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solL AMELIORATION
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A geneml solubi iy duyam is given below [or soil
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nunerals; lhis is, in leer. a measure oi ihe availaoiliay ul
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speak: mmmls io planls lrnporrani soil eonsiiiuenis
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liron eadmiuin, silieal show a range or mlubilmes wiih
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grid as lollows,
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a wow: very soluble al pH 3.35 as limonne lyeliowl
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reps, and or pH H as iron oxide (rec), whieh
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reddens alkaline dams,
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- ALUMINIUM: very soluble ai pH H 5 and pH
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9 sill as Alpv ielaiivrly insoluble over nnrinal garden
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ranges
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- smco- slighily oui inereasingly soluble over pH
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has. our ihen rapidly bemmg more salnbk- up lo pH
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in assio,
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lion and manganese llen-omaguesiurn mlnerils) are
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elosely assorroied in soils, and show lhe same “at
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irum ol deiieieney wiin old We ran olien lherelore
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ameliorale soils ai ihe higher pH levels wrih ihe
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addiiiuu ul simple sulphur, and resiuie iron, magnee
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rum, and phrsphaie levels io planis il ihese are ‘Iockzd
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up- land iesi as being presenii We seldom garden al
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pH 3—4, our il we do, we wlll need a lairiy massive
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raleiurn inpui as eruslied or burrii lune, or erushed
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shells, la increase ihe availabiliiy nlmnne'nu
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ln ihe dmls, ihe soluble alumnuum and sillea may
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be evaporaied m ihe elay minerals allied lo rlliie or
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monimorlllorile soils. Wi|h all minerals, higher
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iemperaiures in water gruuy irierease soluoiliiy,
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Aluminium ores are usually lorrned al ihe lower pH
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ulna, and hydraled io globsileerbausrnr mas.
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The carbcmir aoid nanarally pieseni in rain land very
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mueh lnereased in rainwaier as li inliliraies soils)
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removes poiash lrom orihorlase iri granlres. ln rhe
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plagioslase or while graniles, ealeium and wdlum
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biearbouaies are similarly lormed, or pomssium and
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magnesium earbeinaies lrom bioiiie roehs lbloiile,
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dame).
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mmusars IN ARID AREAS
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reriilisers, apari lrom humus and hauled animal
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manuies, should be used sparingly rareesdve green
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growlh ion subyd nees, in pnnwhnwdmlhksnss
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Magg suggrsis a have! meihod oi burying rwo plasor
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bags in ihe pianiing Mle lor valuable hear provided
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313
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