Problem to be solved: to provide a water quality improvement method capable of efficiently improving water quality in a water environment such as a tidal flat, and also promoting the growth of living organisms in a water environment.SolutionThe water quality improvement method is the water quality improvement method which improves the water quality of the water environment where the organism inhabits, and the water quality improvement material made of iron fulvic acid and soluble silica is sprayed with the amount of spraying of 0.03 to 1.88 kg \/ m2 per unit area in the water environment As the rate of mud increases, the amount of spraying is increased.Diagram【課題】干潟等の水環境の水質を効率的に改善すると共に、さらに、水環境中に生息する生物の生育も促進できる水質改善方法を提供する。【解決手段】 水質改善方法は、生物が生息する水環境の水質を改善する水質改善方法であって、フルボ酸鉄及び可溶性シリカから成る水質改善材を、単位面積当たり0.03~ 1.88kg/m2の散布量で散布し、前記水環境における泥分率が増加するにつれて、前記散布量を増加させる。【選択図】 図1
