Relationships between various sediment P extractants
Although there were large variations between the P-extractants, they
were significantly correlated with each other with r2values ranging from 0.68 to 0.95. As is observed, the figure of cluster
analyses in the seven mentioned extractants no overall pattern of
distance rather show the noticeable similarity from extractant to
extractant (figure 5). Generally speaking, it seems that the four
extractants (Colwell, Mehlich III, Olsen, and Morgan) extract P from
equally the same pools and strong correspondingly is between Mehlich III
and Olsen. Among the all extractants, 0.1 M NaOH showed quite different
behavior and separated itself in a group (figure 5).