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Physicochemical characterization of humic acids extracted from vermicompost and its impact on growth of Oryza sativa

J.Arunkumar, G.Mathumathi, J.Sivasankari, K.Perumal

The research work focusing the suitable method for extracting humic acid frommanures at farmerÂ’s field. The results reveal that the humic acid extracted by KOH and NaOH have a loosely honeycomb structure characterized by a predominance of flakes and fragments adhering on the surface and fractions exhibited a distinct physical appearance, being close-grained and lumpy. Chemical analysis shows that the predominant components are Mg, Fe, Na,K, Ca, and P in humic acids. Furthermore the EDS spectra also showthe presence ofMg, Fe, Na, K, Ca, and P in the humic acid extracted with KOH and additionalmineralsAl, Si, S and Cl in the humic acid.TheHAE3Humic acid (KOH used for extraction) was showed higher seed germination (88%) and vigour index (31.51%) in paddy (Oryza sativa).