Dynamics of soil phosphorus measured by ammonium lactate extraction as a function of the soil phosphorus balance and soil properties

Summary

This study investigates how ammonium lactate extraction (a widely used analytical method for assessing plant-available phosphorus) responds to the soil phosphorus balance—the cumulative difference between phosphorus inputs and removal—and varies across different soil types. As suggested by the title, the authors quantify the relationship between extracted phosphorus and underlying soil properties, which has implications for interpreting soil test results in the context of farm phosphorus management histories. The work contributes to understanding how to better predict or interpret extractable phosphorus concentrations from soil characteristics and nutrient balance data.

UK applicability

The ammonium lactate extraction method is widely adopted in UK soil testing and nutrient management planning. These findings may assist UK farmers and advisors in interpreting soil phosphorus test results relative to farm phosphorus balances and soil type, supporting more evidence-based phosphorus fertiliser recommendations and compliance with nutrient management regulations.

Key measures

Ammonium lactate-extractable phosphorus; soil phosphorus balance (inputs minus outputs); soil pH, texture, organic matter, and other pedological properties

Outcomes reported

The study examined how soil phosphorus levels measured by ammonium lactate extraction vary as a function of cumulative phosphorus balance and soil chemical and physical properties. The research characterises the relationship between extractable phosphorus and long-term phosphorus input–output dynamics.

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