Extraction optimization and quality evaluation of humic acids from lignite using the cell-free filtrate of <i>Penicillium ortum</i> MJ51.

The F -value of the model was 83.35 and the p -value was less than 0.0001, which indicates that the regression model was extremely significant since the term is considered significant when the “ P -value” is less than 0.05. 27 Furthermore, A , B , C , D , AB , A 2 , B 2 , C 2 and D 2 were also seen as significant model terms.

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