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