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The fulvic acids (FAs) isolated from municipal waste compost (MWC) and unamended and MWC-amended soils in a long-term (nine years) field experiment were characterized to evaluate the cumulative and residual effects of amendment used at rates of 20 and 80 t ha −1 on their chemical, compositional, structural, functional and acid–base properties. With respect to the control soil FA, the MWC-FA...
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