used separately as the only independent variable in the regressions. Na and K are about equally correlated with BIOMASS but at a much lower level than pH and Zn. There appears to be almost no correlation between SALINITY and BIOMASS.
There are two high correlations among the independent variables, K and Na with r = .79 and pH and Zn at r = −.72. The impact of these correlations on the regression results is noted as the analysis proceeds. With the exception of a moderate correlation between SALINITY and Zn, all other correlations are quite small.