Effects of manure and tillage on edge-of-field phosphorus loss in seasonally frozen landscapes
Journal of Environmental Quality
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- Data Release: USGS data release - Data used to evaluate the effects of field-level management practices on edge-of-field phosphorus loading in Minnesota and Wisconsin, 2004-17
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Abstract
Environmental conditions and management practices affect nutrient losses in surface runoff, but their relative impacts on phosphorus (P) loss during frozen and nonfrozen ground periods have not been well quantified. More specifically, the relative importance of manure application, tillage, and soil-test P (STP) has not been assessed at the field scale. In this study, we compiled a dataset composed of 125 site-years of data from 26 fields that were continually monitored for edge-of-field P loss during snowmelt and storm events. Regression tree analyses were performed to rank the level of influence each environmental and management factor had on nutrient loads. Dissolved P (DP) was the majority of the total P (TP) during frozen conditions, but a small portion of TP during nonfrozen conditions. Manure application had a greater influence on the flow-weighted mean concentrations (FWMCs) of TP and DP during frozen conditions than during nonfrozen conditions. No-till resulted in greater TP and DP FWMCs during frozen conditions than conventional tillage, whereas the opposite effect for TP FWMC was seen during nonfrozen conditions. However, regression tree analysis revealed that STP (0- to 5-cm depth) was the most important factor in predicting DP and TP FWMCs during frozen conditions and DP FWMC during nonfrozen conditions. Extremely high STP values were associated with late-frozen manure applications and grazed pastures. Reducing surface P loss in seasonally frozen landscapes will require prioritizing management strategies that avoid manure application through early- and late-frozen conditions and lead to a drawdown of STP, particularly in the top 5 cm.
Suggested Citation
Zopp, Z.P., Ruark, M.D., Thompson, A., Stuntebeck, T.D., Cooley, E., Radatz, A., Radatz, T., 2019, Effects of manure and tillage on edge-of-field phosphorus loss in seasonally frozen landscapes: Journal of Environmental Quality, v. 48, no. 4, p. 966-977, https://doi.org/10.2134/jeq2019.01.0011.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Effects of manure and tillage on edge-of-field phosphorus loss in seasonally frozen landscapes |
| Series title | Journal of Environmental Quality |
| DOI | 10.2134/jeq2019.01.0011 |
| Volume | 48 |
| Issue | 4 |
| Year Published | 2019 |
| Language | English |
| Publisher | ACSESS: the Alliance of Crop, Soil, and Environmental Science Societies |
| Contributing office(s) | Wisconsin Water Science Center, Upper Midwest Water Science Center |
| Description | 12 p. |
| First page | 966 |
| Last page | 977 |