Summary
This multi-region study examined integrated approaches to manage soil phosphorus status for eutrophication control without compromising productivity. Using the APLE model across three contrasting catchments, the authors demonstrated that keeping soil test phosphorus at or below the threshold optimum for fertiliser response would reduce catchment phosphorus losses by 18–40%, though achieving this through STP drawdown alone would require 30–40+ years. The findings emphasise that combining soil conservation with STP management is more effective and rapid than erosion control alone, and that greater precision in STP sampling, analysis, and interpretation is essential for sustainable long-term phosphorus fertility management.
UK applicability
The study's findings are directly applicable to UK farming policy and practice, particularly given intensive arable and mixed farming systems that often accumulate excess soil phosphorus. The threshold-based STP management approach and integrated erosion-plus-drawdown strategy align with UK water quality objectives under the Water Framework Directive and offer guidance for optimising both environmental and agronomic outcomes.
Key measures
Soil test phosphorus (STP) concentrations; soluble reactive phosphorus (SRP) in land runoff; total phosphorus (P) losses (kg ha⁻¹); catchment-scale P loss reduction (percentage); timescales for STP drawdown (years); predictions from the Annual Phosphorus Loss Estimator (APLE) model
Outcomes reported
The study examined the relative effectiveness of soil conservation and soil test phosphorus (STP) drawdown in reducing phosphorus losses to water across three contrasting catchments in Europe, the United States, and Australia. It quantified total phosphorus losses (0.52–0.88 kg ha⁻¹) and projected timescales for achieving eutrophication control targets through integrated management strategies.
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