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Ghapter two
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flourlehsd äeeq$ee of the ¡rore favorabLe ns.is.üure conclltlons,.
Bor thle reason the organlo neterlal ln the souris E:ofle ls
conflaed to the top flve or slr lnehes, whlla organlc natter
fn tbe Red Blver ssfl is founel ae far &sr ee,venteea lnehee to
tws feet Þelow tbe surfeosr Ânothor feature of the solre
found ln the sourlE basl.n ls that they conteln varylng asounte
of eancl, e faetor whieh aLlows the nolature reeelverl üo paee
qulekly through then¡ lea¡rlng the topeoll very dtry, co that
these solls are mueh less rtrougbt reElctant than the cleep olay
loeme: of the REd Blver a_rea.ó
fhe eolLE ln the ÊouthweEtern part of il[anfüoba are. therefore
of two general typee, the dark-brown to blaek transttlon
Eotl f,orne'dl on the tlll pralns about rurtle, Mountafn, anet the
verLous sandy loqns.foraeit fron the s,Eitlnents dapoeltett in Èbe
basln of graclal r,ake sourls. Both of these types have one
featute' ln eommsnr, they are les,e, dtfeught-resÍs.tant thAn sol.le
1n ühe nolsÈer reglons to ühe eagt anel north, but j.n oRe lnport-
ant detall' they dtlffer. MolsturE dloes not penetrete Jû,orE, than
flre ts ae,ven inehes lnto the solr sn the tlrl plaln, eo that
whet nOleture Ls. rocefved le helô ln the top-s,s11, whlle tbe
sub-eolI renalns dry ln nornal EG&gonBo gn t¡.e otben hendl, mueb
of the nolEtr¡re rEeelvedt by the sandy salLs of the sourle
basln penetratqg yery quiokly r.nggþne subsotl, leavlng tbe topsoll
cÌry, whlLe at tbe Eane tlnE fornlng e reserrslr foun to
55
Eeven feet below the sunfaee.-rhe dark brown to blaek soll.s: of
@ El-11s, golls B. 48.