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Fig. 2. Relationship between organic carbon concentration of fulvic acid and absorbance at 420 nm. Water(2h)–extractable fulvic acid and NaOH(2h)–extractable fulvic acid represent samples sequentially extracted for 2 h with water and NaOH, respectively.





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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome