Humic acid (HA) waa wax soo saar ilaa xad deggan oo ka soo baxa walxaha dabiiciga ah oo sidaas darteed ku urura nidaamyada deegaanka.Humic acid waxa laga yaabaa inay ka faa'iidaysato korriinka dhirta iyadoo la jeexjeexo nafaqooyinka aan la heli karin iyo pH.Waxaan baarnay saameynta HA ee koritaanka iyo qaadashada nafaqeeyayaalka yar yar ee sarreenka (Triticum aestivum L.) koray hydroponically.Afar daawaynta xididka xididka ayaa la barbardhigay: (i) 25 micromoles chelate synthetic N- (4-hydroxyethyl) ethylenediaminetriacetic acid (C10H18N2O7) (HEDTA at 0.25 mM C);(ii) 25 micromoles chelate synthetic oo leh 4-morpholineethanesulfonic acid (C6H13N4S) (MES at 5 mM C) pH buffer;(iii) HA at 1 mM C oo aan lahayn chelate synthetic ama baffer;iyo (iv) aan lahayn chelate ama baffer synthetic.Fee inorganic oo ku filan (35 micromoles Fe3+) ayaa la bixiyay dhammaan daawaynta.Ma jirin farqi weyn oo la taaban karo oo u dhexeeya wadarta biomass ama miraha abuurka ee daawaynta dhexdooda, laakiin HA waxay wax ku ool u ahayd hagaajinta chlorosis interveinal caleen ee dhacay intii lagu jiray korriinka hore ee daawaynta aan la hagaajin.Caleen-tissue Cu iyo Zn waxay ku yaraayeen daawaynta HEDTA marka loo eego chelate (NC), taas oo muujinaysa HEDTA waxay si adag u adkeysay nafaqooyinkan, sidaas darteed hoos u dhigista hawlahooda ion ee bilaashka ah iyo markaa, helitaanka noolaha.Humic acid ma aysan kakan Zn sida adag iyo qaabaynta isku dheelitirnaanta kiimikaad ayaa taageeray natiijooyinkan.Tijaabada titration waxay muujisay in HA aysan ahayn kaydka pH ee 1 mM C, iyo heerarka sare waxay keeneen HA-Ca iyo HA-Mg flocculation ee xalka nafaqeynta.
