Event-based edge-of-field phosphorus loss in Wisconsin and Minnesota

Edge-of-field monitoring was conducted by the University of Wisconsin Discovery Farms program between 2004 and 2019 across Wisconsin and Minnesota. Twenty-two farm fields were monitored across 125 site-years and 1339 individual runoff events. For each runoff event, total runoff and total phosphorus (TP) and dissolved P (DP) (both as flow-weighted concentration and load) were measured following Discovery Farms and USGS protocols. For each runoff event, some variables changed event to event, while others did not. Some variables never changed per site (e.g., texture, soil test P), while others changed annually (crop, previous crop, tillage) or changed seasonally [e.g,. soil condition (frozen vs. non-frozen) or soil surface condition (actively growing crop, crop residue, or no residue)]. Many variables are provided that change by event, most notably time since manure application, rainfall, and time since last tillage operation. Collectively, this dataset provides as much information as poss..., Site Descriptions
Discovery Farms Wisconsin and Discovery Farms Minnesota, in partnership with the U.S. Geological Survey, have collected 125 site-years (2004 - 2019) of event-based EOF surface runoff data from 22 fields that contain a total of 1339 individual runoff events. Sixteen of the fields are in Wisconsin (n = 803 individual events), and six are in Minnesota (n = 536 events) (Figure 1). Across all sites, the dominant crops were corn, soybean, and alfalfa. The drainage area of these sites varied from 2.4 to 17.0 ha with an average of 7.9 ha. Most of these sites were located in fields with slopes greater than 3% (19 sites), with only three sites having slopes less than 3%. Soil texture was characterized as primarily silt loam (17 sites) according to the National Cooperative Soil Survey (websoilsurvey.cs.egov.usda.gov), with other textures being loam (2 sites), clay loam (1 site), silty clay loam (1 site), and sandy clay loam (1 site).
Soil Analysis and Runoff Sampling
Water quanti..., , # Event-based edge-of-field phosphorus loss in Wisconsin and Minnesota

Dataset DOI: [10.5061/dryad.hx3ffbgpv](https://doi.org/10.5061/dryad.hx3ffbgpv)

## Description of the data and file structure

#### File: DF_dataset.csv

**Description:** csv file with missing data labeled as \".\"

##### Variables

* ID: unique number assigned to each runoff event
* siteID: a combination of field ID and calendar year
* fieldID: Discovery Farms code for an individual site
* state: state in which the field resides
* averageslope: Average slope for a field as determined by LiDAR
* drainagearea: estimated drainage area from USGS (ac)
* soiltype: surface soil texture, obtained from web soil survey
* hydrologicgroup: hydrologic group, obtained from Web Soil Survey
* drainageclass: drainage class, obtained from Web Soil Survey
* Tile: designation to if the field has artificial drainage (Y=yes, N=no)
* typicalcroprotation: description of the crop rotation sequence
* Crop: Active crop being grown, assigned f...,