Summary
This study characterised phosphorus pools and supply potential in agricultural soils across three districts in Tigray, northern Ethiopia, where strong phosphorus fixation limits crop availability. Using sequential extraction and availability ratios, the authors identified district-specific Ca/P and Al/P change points that control phosphorus accessibility for plant uptake, suggesting that optimal fertiliser recommendations must account for local soil mineralogy and parent material composition.
UK applicability
The findings have limited direct applicability to UK farming, where phosphorus fixation and availability constraints differ substantially due to less weathered soils and higher soil pH. However, the methodological approach of using Ca/P and Al/P ratios to predict phosphorus supply potential may offer a transferable framework for refining phosphorus recommendations in other low-pH, highly weathered soil systems.
Key measures
Total soil phosphorus (mg kg⁻¹); Mehlich3-extractable phosphorus; Hedley sequential extraction scheme fractions; Ca/P ratio change points (696:1, 1926:1, 401:1 across three districts); Al/P ratio change points (97:1, 284:1, 30:1 across three districts)
Outcomes reported
The study measured total phosphorus content, phosphorus availability, and sorption capacity across soil samples from three districts in northern Ethiopia using sequential extraction and Mehlich3 methods. It identified district-specific change points in Ca/P and Al/P ratios that determine phosphorus supply potential to crops.
Topic tags
Dig deeper with Pulse AI.
Pulse AI has read the whole catalogue. Ask about this record, its theme, or how the findings apply to UK farming and policy — every answer cites the underlying studies.