Fig. 5. Effect of seven clippings of P. smithii and M. sativa on soil saturation and oxalate-extractable Se in shale/soil mixtures with or without plants. Symbols for the planted treatments represent the means from 8 pots ± standard errors. Symbols for the unplanted treatments represent the means from 2 pots ± standard errors. Linear regressions at P 0.10 are provided in the legends.