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Contour plots (left) and three-dimensional response (right) of the extraction efficiency (DNJ yield, Y) influenced by 3a: the range of pH value (X1) and content of potassium nitrate (X2), 3b: the range of pH value (X1) and the inoculum volume (X3), and 3c: content of potassium nitrate (X2) and the inoculum volume (X3).
