ptuttestteet |ayer30rm below the surtaeedt garners. tn suits that heeotne waterlogged, we ran reset! to raised beds or deep dratns tu reduee r ttrated water bulld-np, or plant trees to keq) aetrye transpirattarr gurng and so reduee salt water tables and Vehnmldlr’y the arr Two taeturs at least alien sell wa|er avattatatttty- . The strength at moteeutar pondtng et water |u partretes tn the sort tranre bondst Planl rout narrs eannot remote thts pound-water at pmsum above ts atmospheres - The salt edntertt ot the water Tm many salts, and the 50' water exerts reverse nsmollc pressures ml plant mots, and will take Mam horn the roots, 811 GASEDUS CONTENT AND PROCESSES IN SOIL So are penneated, wnm not watertagged, by the gaseaus eornpdnens u! the atmosphere tsawt nttmgrert mt oxygenl. Thrs enters the sort vta pore spares, Hacks, and antrrrat burrows, and dtttttses yta pore spaces to plant roots The enrhange ol gases, .trna. sphere ttr sort and sort to ammsphenhlhz breathing ot unhils aehteyed try a set 0! physreal and brotogreat pmcuses, some otw eh are - EARTH TKDES. The moon ttdes, rnueh subdued on eontrnentat masses. neyerthetess attest greundwaters tn eotrtrtes ur boulders, the earth ttselt labour zs em use and tall aeross the eonnnetttal USN, and ot eourse the sorts tat estuattes and mud ttats twhere atr ean tse seer. lsutshttng up tor hours as the min nsest Ever/what, low at htgh pressure eellsand mrbulem wmd new creates atr pressure dttterenttats that draw out or Inyed atr \‘la ereyrees and trssures, or bumws These same etterts a or retard the dtttuston or water yapaur icwss sell surtates, and rust as the wtnd dru- out audaee snlls so u aka, by last new, draws out other gases tram sort The gases at wil res ‘ than trartrerrr dtdxtdet, uxldilion, aerotne and anaerohte rtwtapotte preeesses, radon hum radroaettye deny, and simple or complex hydmoaxbuns trorn earth depostts or humus deeay pass to an Mudl at the ammonta and carbon dloxlde tn the atmosphere, and at least we at the methane, is supplted by sot] . ptoLoctcAL EXCHANGE A stngle large broadleal tree, amyely teansptrlng. may rnerease the area ot tramptratron ot orre aere at start by a laclor ot tony, a torest may do su by hundrrd) ot ttmes. 5o oxygen, eartran xidc, water vapunx, metallte yapaurs, :mn'wnll, and hydrogen or ehlortne 332: are transpired by algae, rushes. erops, trees, and hubs or mm mm groups yary mendously tn the volume ardeornposttran at gases transptred, Although we owe trtueh atottr aernospherte oxygtn to uees,a gmt many Mil-woody plant speetrs eorrsume more oxygen than 204 they prudure. Thus, the plant rs a gaseous translator, tradtng both ways wtth arr and sort game speethes ttt thr trade are gtvert tn the seettrtn below an oxvgznruhvlene pluczsscs Annuals, km, are yery aetne tn upemng up sorts wtth small ur large hurnrws, these at as pump ptstons {Ilka a tram tn a tunnett |u draw In and exhaust txtth thetr waste gases and atmospnme gaseous elements, whreh are then drttttsed ta mnk tta sol! pores Marty out-rowers «ants, crabs. terrnrtes, pratrra dogs. wttrms, land eraytrsht rarse trp mounds rtr Chlmncys whteh then act as ntdt mm tnratr ttttw ttr ttt ereats- pwssure dtllarenttals whlch draw arr acllvzlv thrnugh thetr nurrows Or they (led large surtaee struetures rtt penneatrte sedtmerrts aerttss whteh waste gases dttluse leg tenrttte moundst. fly a great many wdt dettees, ann-ttals eentt-tve In true tn aerated er atmtndrttoned undergmunds, and tnerease gaseous exchange tn the Salk. FIG"!!! I 5 lel WEE DONSWUCVED av A LAND auxanwm All Haw trntttnes sorrow and "mum waste gases GAst MANUFAUURED IN sons By way tat tttanrum ar ruttte mm, amenrrnta ts manutaetured tn sands tr. the presente ot sunttght By way at teemus imn, ethylene tcyttyt ts mantrtaatured tn anaerotatc srnt mternsrtes tn anaemhre sruls and waters, esrtson drprtde, methane, sutptturetted hydrogen. ethylene. and sulphur dturtde are termed. and eseape ta arr as tnogas or marsh gas The same products are present tn the muted sotts ot hydrophobtt elays tn winter, soils where Numb stauemre has been destroyed by mtsttse. where salt has dzflocnlhlzd clays and eaused sttrt rattapse, or where water penedreally floods the sort Many at [hm gaats are totrnd as a result at humus decay and thtuhaetlltts tsutphur paeteetat action Ammoma is released tram aetryety nudutattng legumes thees and turost. and ts used in unptaughed sorts as a plant nutetent.1hus.gaseons mmponnds are eonttnually made tn the sotl ttselt by proeess ot autumn: growth and deeay tn the presenee at metattre