Ny nofon-tany dia fifangaroan' ny zavatra ôrganika, mineraly, etona, ranon-javatra ary zavamananaina miara-mihazona ny aina.
Manana anjara asa efatra ny nofon-tany: fitaovana ahafahan' ny zavamaniry mitombo, fitaovana fitehirizan-drano, famatsiana ary fanadiovana, ny fanovana ny atmôsfera eto an-tany, ary toeram-ponenan' ny zavamananaina. Ireo asa rehetra ireo indray no manova ny tany sy ny toetrany.
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