ʻO ka waiuma Humic (HA) kahi huahana paʻa o ka decomposition mea olaola a pēlā e hōʻiliʻili ai i nā ʻōnaehana kaiapuni.Hiki i ka waiuma humic ke hoʻopōmaikaʻi i ka ulu ʻana o ka mea kanu ma o ka hoʻokaʻawale ʻana i nā meaʻai i loaʻa ʻole a me ka pale ʻana i ka pH.Ua nānā mākou i ka hopena o ka HA i ka ulu a me ka lawe ʻana i ka micronutrient i ka palaoa (Triticum aestivum L.) i ulu hydroponically.Ua hoʻohālikelike ʻia nā lāʻau lapaʻau ʻehā aʻa: (i) 25 micromoles synthetic chelate N-(4-hydroxyethyl)ethylenediaminetriacetic acid (C10H18N2O7) (HEDTA ma 0.25 mM C);(ii) 25 micromoles synthetic chelate me 4-morpholineethanesulfonic acid (C6H13N4S) (MES ma 5 mM C) pH pale;(iii) HA ma 1 mM C me ka ʻole o ka chelate synthetic a i ʻole buffer;a (iv) ʻaʻohe chelate synthetic a i ʻole buffer.Hāʻawi ʻia ka Fe inorganic nui (35 micromoles Fe3+) i nā lāʻau lapaʻau āpau.ʻAʻohe ʻokoʻa koʻikoʻi ma ka helu ʻana o ka biomass a i ʻole ka hua hua ma waena o nā lāʻau lapaʻau, akā maikaʻi ʻo HA i ka hoʻomaikaʻi ʻana i ka chlorosis interveinal lau i loaʻa i ka ulu mua ʻana o ka lāʻau nonchelated.He haʻahaʻa ka nui o ka lau-tissue Cu a me Zn i ka mālama HEDTA e pili ana i ka chelate (NC), e hōʻike ana i ka HEDTA i paʻakikī i kēia mau meaʻai, no laila e hōʻemi i kā lākou mau hana ion manuahi a no laila, bioavailability.ʻAʻole paʻakikī ka ʻakika Humic i ka Zn e like me ka ikaika a ua kākoʻo ka hoʻohālike hoʻohālikelike kemika i kēia mau hopena.Ua hōʻike ʻia nā hoʻāʻo titration ʻaʻole ʻo HA he pale pH kūpono ma 1 mM C, a ʻo nā kiʻekiʻe kiʻekiʻe i hopena i ka HA-Ca a me HA-Mg flocculation i loko o ka meaʻai meaʻai.
