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The values and ratios are in μM, never said they were anything else. The ratios were also given in the study.their figures are in μM. the ratio is actually 141:1
high nitrogen/low phosphorus (HN/LP = ~ 38 μM NO3−/~0.18 μM PO4−; N : P ratio = 211:1)
That means
phosphate: 0.017 ppm
nitrate: 2.4 ppm
cheers