Dynamics of Inorganic Phosphorus Released to Flooded Water by Paddy Soil Disturbance

― A laboratory assessment ―

Abstract

The dynamics of substances in flooded water after soil disturbance caused by mechanical weeding in paddy fields are not fully understood. This study investigated the dynamics of dissolved inorganic phosphorus (DIP) released from soil to flood water due to soil disturbance in pots simulated paddy fields with soil managed with two different fertilizers, one chemical fertilizer and the other compost. The pots with soil managed with compost had an increase in DIP in flooded water as a result. It was considered that the increase in DIP in flooded water in the compost soil plots of the simulated paddy fields was influenced by the molar ratio of iron (II) to DIP released into the flooded water and pH of the flooded water.