Fig. 6. Significance ( level for rejecting H0) of the partition between two soil groups below or above the [P/(Al+Fe)]M-III ratio as an index of P saturation (IPSM-III) separator on the x axis.
level for rejecting H0) of the partition between two soil groups below or above the [P/(Al+
Fe)]M-III ratio as an index of P saturation (IPSM-III) separator on the x axis.