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1990) montre a quel point <strong>les</strong> <strong>sols</strong> <strong>de</strong> ce groupe (ayant fait I'objet d'etu<strong>de</strong>) sont susceptib<strong>les</strong> a la <strong>de</strong>terioration <strong>de</strong> lastructure, a I'acidification, a la surfertilisation en phosphore et potassium et, en moindre importance, a unediminution <strong>de</strong> la matiere organique, lorsqu'ils sont sous monoculture <strong>de</strong> cerea<strong>les</strong> ou <strong>de</strong> pommes <strong>de</strong> terre.Tableau 5. Caracteristiques <strong>de</strong>s series <strong>de</strong> sol associees aux <strong>de</strong>pots fluvioglaciaires, fluviati<strong>les</strong>, glaciolacustre et alluvionnaires.B. ChimiquesSiries pH H~ pH NaF M.O. Ca t!ch Mg ech K ech CEC Sal base P ass CalCEC KICECPalmer"""',,...fo.~~'.".~.nt aci<strong>de</strong>o:.? "'~I~~~ f.~i~I~ "'''''''''' faiblef~i.b..I~ "'. faible < , !~i~I.~ IJ.I:I~~~~ "'."''.?:~...."' "'''' "' .."'~:.~-,"' ~~.~'.~ .~o.~~'.".~~~..f.~.i~.I~'.":'.II aci~~ ~ 9,0 ~~.r:..~...'.".?y:~... f.~i~I:."'''' f.~.i.~I~ ."' ~~~.~'.~ f~i~I: f~i~I.: ..."'."'~~~~~: ."'.'" ........~.~~.~~.."''''.'''"' > 10,0... "'~I~~~ f.~i~I~ '.".?y~.~.I.b..I~ ~~~~I~ ~~.~.~b.I.~ f~i~I.: faible 10,0 falbiefaiblefalble < 1,0%... '.".?.y.:.~~.~"'.p..~~.~'.~ f.~i.~I~"'... "'f~i~I: ...~.y..:.".'.~~.~.~..."' "'''''"~~I.~~:~~~.~~.~.. .~o.~~'."~.~..~..f.~i~I~.'.":'.II..~~~~ ~.i~~.~ ..faibl~ "'."'..~.~.~~~i.b.I.~p..~~.~'.~ "...~.I.:.~~~~.i.b..I.:.." f~~I.: ...,,"'..~~.~~'.~ ,," ~"1.:.?:~,,..Bishopton fortement aci<strong>de</strong> a neutre aleva falble richenaible pauvre aiev9naible ""' faible/moyen pauvre " ""t.~i~I~",,"'faibie < 1.0%> 10.0~~.~!.!.~!"" " t.o.~~.'.".~.~..~~.~.~"""""'.."""' "'~.I~.~.~"'..."",,.,,. """"""!.~i.~I~ ",, .,,"",,'.".?y~~.ib..I.~ ~~~":'~.~.~~~: .."""",,!~!.b.I.~,, .""",, f~i~!:"' "'. ".~~~.i.~.I~."'.,,""''.~i~!~ < 1.0%Fourchette moyennement acl<strong>de</strong> """" """ 9,0-' 0,0 aleva faible faible pauvre falble pauvre/moy faible