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The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

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Estimating soil P pools and desorption rates using flow-through cells.

Carl H Bolster¹, Chad J Penn²

¹USDA-ARS, Food Animal Environment Systems Research Unit, Bowling Green, Kentucky, USA.

Journal of Environmental Quality

|October 7, 2025

Summary

Understanding soil phosphorus (P) release is key for agriculture and water quality. This study used flow cells to measure P release rates and amounts, finding that flow velocity significantly impacts results.

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Area of Science:

Soil Science
Environmental Chemistry
Agronomy

Background:

Dissolved phosphorus (P) release from soils impacts crop nutrition and water quality.
Accurate prediction of P release is essential for effective land and water management.
Existing methods may not fully capture the dynamics of P release under varying conditions.

Purpose of the Study:

To investigate the amount and rate of phosphorus release from diverse soils.
To evaluate the influence of flow velocity on P release kinetics using flow cells.
To correlate measured P release parameters with soil properties.

Main Methods:

Utilized flow cells operating at low and high velocities to assess P release from 22 soil samples.
Applied a one-dimensional advection-dispersion equation with two P pools (Q1 and Q2) to model P release data.
Compared fitted P pool sizes and kinetic desorption rates between different flow velocities.

Main Results:

The advection-dispersion model accurately described P release data across both flow velocities.
Slow flow released more P at higher concentrations, while high flow exhibited a faster release rate.
Readily available P pool (Q1) estimates correlated well between flow velocities and with soil P tests (P_Ox, P_M3, P_W), though kinetic rates showed weaker correlations with soil properties.

Conclusions:

Flow-through cells are valuable tools for assessing soil P release, but outcomes are sensitive to flow velocity.
The readily available phosphorus pool (Q1) is a key indicator, correlating with standard soil P tests.
Further research is needed to fully understand the relationship between soil properties and P release kinetics.