Humic acid (HA) ndi chinthu chokhazikika cha kuwonongeka kwa zinthu zachilengedwe ndipo motero amaunjikana m'dongosolo la chilengedwe.Humic acid ikhoza kupindulitsa kukula kwa mbewu poyesa zakudya zomwe sizikupezeka komanso kusunga pH.Tidawunika momwe HA pakukula komanso kadyedwe kake kakang'ono mu tirigu (Triticum aestivum L.) wolimidwa ndi hydroponically.Mankhwala anayi a mizu-zone adafanizidwa: (i) 25 micromoles kupanga chelate N- (4-hydroxyethyl) ethylenediaminetriacetic acid (C10H18N2O7) (HEDTA pa 0.25 mM C);(ii) 25 micromoles synthetic chelate ndi 4-morpholineethanesulfonic acid (C6H13N4S) (MES pa 5 mM C) pH buffer;(iii) HA pa 1 mm C popanda chelate yopangidwa kapena buffer;ndi (iv) palibe chelate kapena buffer.Ample inorganic Fe (35 micromoles Fe3+) adaperekedwa muzochizira zonse.Panalibe kusiyana kwakukulu pakuchulukirachulukira kapena zokolola zambewu pakati pamankhwala, koma HA inali yothandiza pakutsitsimutsa tsamba la interveinal chlorosis lomwe lidachitika pakukula koyambirira kwa mtengo wosasinthika.Minofu ya masamba a Cu ndi Zn inali yochepa mu chithandizo cha HEDTA chokhudzana ndi palibe chelate (NC), kusonyeza kuti HEDTA inasokoneza kwambiri zakudyazi, motero kuchepetsa ntchito zawo za ion zaulere ndipo motero, bioavailability.Humic acid sinavutike ndi Zn molimba komanso kufananiza kwamankhwala kumathandizira zotsatirazi.Mayesero a titration adawonetsa kuti HA sinali yothandiza pH buffer pa 1 mM C, ndipo milingo yapamwamba idapangitsa kuti HA-Ca ndi HA-Mg isunthike muzomera.
