130 lines
3.6 KiB
Plaintext
130 lines
3.6 KiB
Plaintext
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modern him As aeawaiee eyaporaios, (irst ialeiie and
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dolomite, men gypsum and anhydi-iie sepaiaie out, all
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are med ior soil Eondlllomllg. pH adiiisimeni, or to
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restoie soil erumb siriieiiire.
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Neil, rock sales crystallize om, biii only wei irupieal
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uplands may aduilly laek this common nutrient,
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allhnugh even iheie speeiiie planis (allen aquatiei
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eonteniraie sali whieh (an be gatlwlrd or leaehed hdin
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iheirashes
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lasfly, pmdsh, mlgneslum salts, and a host 9! minor
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elemenis remain, the evapmiils ittiose already
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deposited; being the mosi soluble nnd iheietoie earliesi
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deposited, TM liquid ihai remains alter the eornrnori
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sali eoneeni deposition is a ”(h sonree ol minor
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minerals end irate elemeiiis. it is, in iaet, sold ii
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~biiierni~ ibiiier oily niiidsi tor diluiiiin and
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immunon in mop soi , or in low eoneeniratioiii
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(diluied lwsmil) used direeily as iiiliar sprays in
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atiengths Virymg lrom l-zo l/ha Very eoriosiiie,
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liltiei-iia iwhieh indude bromine and many oi the early
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elements oi the periodie table, plus some rare
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minerals), are saiely held and disinbiited only via
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non<oriwive vessels and pipes (today, poiyeihylene
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papa and drums).
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mm are dlup, and easily mmporbed hi leaehed
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aieas, biit their euoeis musi be established by loeal
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timls oii speeiiie erop. As timeeyaponies aie so easily
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dissalved they are also those most likely to be earried
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iii sea in iris
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mm
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craniiis column ielspais yielding potash or sodium
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salts Limestone and dolomite yield ealeium and
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magnesium, and mineral deposits or iheir ores give
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traees oi the bane minor elements 01 these, ealeiiim (in
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all bul highly taleareoiis areasi is mosi needed,
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dolomite ieiieept wheie magnesium is aheady in high
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mum is next, phosphaies and telapars lollow, along
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with true elements in small qulnlme: ias low as 5.7
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igloo ha int zinc. topper, mbah, and molybdenum,
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Field ei-ials have esin ished ihai eheap eiies, tinely
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giound, are as euairiye as more relined sulphales or
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oaidea lLeeper mzl. Someilmes sueh minerals are
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given to aniinah as salt mks, in molasses, in water, or
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as inieeiions or “bullds” oi slowerelease elements
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icobaltl in a pellet which lodges in IN ruinen, Some
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mineral elemenls also ream ptnnm VII LU'IM, but ioliar
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sprays are more rapidi g and eitsoive.
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nne mtk dusts ova Spedllt nxk suited ioloeal meds
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are ohen eheaply available troni quarries or grayel pits.
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basali dusts are helpiul, tor :xample, on leaehed
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iropieal soils Rock phosphate eoniains s-ls-Ji
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phosphouos, but is very slow to release nutrieni, and
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may in ten beabsorbad tornpleiely on ioleaehed clays
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ind (lay-Imms. super-arid phosphate added to
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composi, or to plants used in eumpost, may be
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neeessary iinder sueh eiiiiditions, Rock dust as an
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niiseleeeiiie ukgmy oon du as mum harm as good on
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soils, adding eitesaiye or poisonous nutrients in lame
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eases, or enoessiwe mieronuments,
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8 7
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THE DISTRIBUTION OF ELEMENTS
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IN THE SOIL PROFILE
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There ieeiii to be Iwo important deierminanis oi the
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concentration olelenienis or nutrients Ihmugh the soil
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proiile ithdi vzniul eolumn eil soil horn the sin-hm iii
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2 m or ao deep: The dial is the peiieiraiion oi warm,
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Water is a uniyemal solvent, enabling eoinpiiunda to
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dissoeiaie iulo ions, and Innspo‘mng ihem, firstly, to
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val-mus deposit. at inisrosiies in the Jail This eiceee
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works in three dimensions
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. Water iraiiels byi ‘ ration io varying depths,
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soaking in [term the siiriate dawn
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. Waier can also rise lroni the soil water table
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upwards, either by rloodinp, by capillary aeilon
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leoiiiiniied on page 195
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‘—IER)'IEAB‘L auosmn. —-+—-—IHI'EJU1W£ aim
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suizm, muscles
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l
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J
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W was #sazni. sou—s
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A
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188
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