This research was conducted from February to April, 2018 in the Peatland of Kualu Nenas Village, Kampar District, Riau Province. Objective of this study was determine the effect of biomass of Azolla microphylla on the chemical water parameters of peat soil ponds. Method of this researchwas used on experimental, used Complete Randoimned Desaign (CRD) for one factor 4 treatements P0 (without biom…