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doi> Canellas, Luciano P. ; Spaccini, Riccardo ; Piccolo, Alessandro ; Dobbss, Leonardo B. ; Okorokova-Façanha, Anna L. ; Santos, Gabriel de Araújo ; Olivares, Fábio L. ; Façanha, Arnoldo R. . Relationships Between Chemical Characteristics and Root Growth Promotion of Humic Acids Isolated From Brazilian Oxisols. Soil Science, v. 174, p. 611-620, 2009.

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