Placement of Ion-Exchange Membranes for Monitoring Nutrient Release from Flooded Soils
Bremer, E. J.J. Miller, and T. Curtis. 2018.
Abstract
Placement of Plant Root Simulator (PRS ® ) probes (ion-exchange membranes in a plastic support) may
strongly influence nutrient supply measurements and their relationship to nutrient loss to overlying water due
to gradients in ion activity and redox potential with depth. A laboratory study was conducted with two soils contrasting in potential nutrient loss (manured vs. unamended control) to determine the impact of probe placement
(vertical, horizontal, and flat on the soil surface) on nutrient supply rate. The supply rates of the redox-sensitive
nutrients Mn and Fe were generally 1-2 orders of magnitude lower for PRS probes placed on the soil surface than
buried vertically. In contrast, the supply rate of P and K varied by 1-2 orders of magnitude between soils, but placement impacts were modest or absent. The ratio between manured and control soils in water P concentration was
identical to that of soil P supply rate determined with PRS probes placed flat on the soil surface. All placements
were effective in demonstrating the increased potential for loss of P and K from the manured soil, but only measurements from PRS probes placed on the soil surface were closely related to loss of the redox-sensitive nutrients
Mn and Fe.
Key Words
surface water quality, phosphorus loss, wetland, manured soils.
