Characterizing the fine-scale spatial distribution of soil phosphorus for efficient phosphorus management in an Illinois tile-drained field.

ABSTRACT: Closed depressions in post-glacial landscapes can accumulate phosphorus (P) due to repeated flooding and become hotspots for P loss when underlain by subsurface (tile) drainage. Soil P mapping is routinely based on the interpolation of samples from a 1-ha grid, which may miss closed depressions and underestimate soil P levels leading to overfertilization and nutrient loss. Our objective was to improve the characterization of the spatial distribution of soil P at the sub-field scale by accounting for depressions and assess their importance for fertilizer prescriptions and tile P loss. We evaluated the effectiveness of stratified sampling that included closed depressions within a 1-ha grid and nonstationary interpolation (external drift kriging) that leverages information about depression de

SUBMITTER: Ferrari LA 

PROVIDER: S-EPMC12431949 | biostudies-literature | 2025 Sep-Oct

REPOSITORIES: biostudies-literature