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- W2068182891 abstract "Humic substances of molecular size above 10 Kds were obtained by ultrafiltration of the neutralized pyrophosphate extract of an undisturbed Fluvisol. Acidification to pH 2.5 with oxalacetic acid (an acid regularly present in the rhizosphere) shifted the molecular size towards values below 10 Kds. Aliquots of the acidified humic solution were loaded into an HPLC system equipped with two gel-filtration columns in series (Waters Ultrahydrogel 250, 120). Fractions were eluted with pure water and recorded by UV absorbance at 254 nm. Auxin, gibberellin, cytokinin activities were evaluated in each fraction. Humic substances are shown to contain constituents requiring polymer dissociation to display plant growth regulatory activity." @default.
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- W2068182891 date "1989-06-01" @default.
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- W2068182891 title "Plant growth regulator activity of small molecular size humic fractions" @default.
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- W2068182891 doi "https://doi.org/10.1016/0048-9697(89)90176-9" @default.
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