Phosphorus tests and sediment properties
Pearson’s correlations were performed to investigate the relationship
between P extraction efficiency and sediment physico-chemical properties
(Table. 6). The P extractants were negatively correlated with pH and the
correlation was strongest with 0.1 M NaOH. Wang et al. (2012) who found
that pH was important soil parameter to all the equations relating P
concentration in leachates with Olsen-P, Mehlich III-P, and Bray II- P
concentrations. Obviously, the correlation factor was higher for Colwell
than other P extractants for EC (r = 0.93, P <0.001). The
study by Arfania et al. (2018) revealed that sediment chemical
properties such as electrical conductivity, organic matter, pH and
calcium carbonate, had effects on the distribution and bioavailability
of P pools. Calcium carbonate equivalence (CCE) was negatively
correlated with Colwell and NaOH 0.1 M. Olsen, Colwell and 0.1 M NaOH
extractant were positively correlated with organic matter content Jalali
and Jalali. (2017) reported that pH, and EC made important contributions
to most P release from leaching column, while OM and silt content was
less contributed on P availability. A positive correlation of Olsen and
Mehlich III with the silt fraction indicated the influence of sediment
particle size on P bioavailability (Table 6).