Contribution of new and old phosphorus from organic and inorganic fertilizers in subsurface-drained fields using machine learning.

Phosphorus (P) is essential for crop growth but leaches through subsurface drainage discharge, impacting water quality. This study’s objectives are: (1) apply machine learning to quantify the contributions of incidental (new) and legacy (old) P in drainage discharge from Organic site and Inorganic site, and (2) evaluate the effect of manure application timing on P loss. We collected data from two on-farm sites in southeast Michigan, USA. We applied the Weighted Regression on Discharge and Seasons (WRDS) equation to analyze P load based on drainage discharge and fertilizer application timing. The data was divided into calibration and validation sets, and machine learning was employed for training. The results showed strong model prediction performance. Organic fertilizers contributed approximately twice the total phosphorus (TP) loss (7.54 kg ha⁻¹ vs. 3.73 kg ha⁻¹) and nearly four times the dissolved reactive phosphorus (DRP) loss (4.90 kg ha⁻¹ vs. 1.05 kg ha⁻¹) compared to inorganic P l..., , ## Contribution of New and Legacy Phosphorus from Organic and Inorganic Fertilizers in Subsurface-Drained Fields Using Machine Learning

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This dataset contains field-scale subsurface drainage, precipitation, and phosphorus load observations collected from subsurface-drained agricultural fields managed with organic and inorganic fertilizer systems. The data support analysis of total phosphorus (TP) and dissolved reactive phosphorus (DRP) transport dynamics, including differentiation between new and legacy phosphorus contributions, and are intended for use in statistical and machine learning–based modeling frameworks.

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## Description of the Data and File Structure

This dataset consists of a single Microsoft Excel workbook containing time-series observations of hydrologic and phosphorus transport variables measured at two experimental subsurface-drained field sites. The workbook is organized into separate worksheets to distinguish fertilizer managemen...,