November 1 Abstract- "Runoff and
Phosphorus Issues Related to Winter Application of Manure"
November 1 View the Powerpoint Presentation
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November 1 Roundtable Minutes
Conclusions & Resolutions
- The physical characteristics and management
of today's manure is different than yesterday's.
- The environmental impacts of manure vary as a function of the form
of phosphorus contained in the manure (soluble P, total P).
- Phosphorus management practice recommendations need to consider characteristics
of the "receiving water."
- Overall manure application strategies are broader than just winter-spreading
issues.
Fall, early spring, etc. applications need attention as well.
- Manure is a beneficial soil amendment.
- Nutrient management planning helps farmers identify and evaluate risky
manure spreading situations.
Issues to Resolve
- The time, labor, and money issues required for sound manure management
on farms.
- Nitrogen and manure management issues, specifically atmospheric emissions.
- Can the detrimental effects of winter-spread manure be avoided with
manure storage?
- Can the Wisconsin dairy industry survive without winter applications
of manure?
- Is there the political will to enact winter-spreading restrictions?
- Will restricting the winter-spreading of manure solve the problem?
Research & Information Needs
- Runoff studies evaluating various forms and types of manure for their
environmental impact.
- Evaluation of the environmental impact of various forms of P (SP,
PP, etc.) in runoff from winter-spread manure.
- Evaluation of receiving water characteristics in the determination
of P management practices.
- Development of models for predicting winter losses of P and runoff
as a function of soils, type of frost, thaw characteristics, rainfall,
snowfall, etc.
- Start with a review of existing data (could be substantial).
- Investigation of the effect of manure on groundwater recharge.
- Study and attempt to quantify runoff characteristics as a function
of seasonal rainfall timing.
- Investigation of the effect of harvest management strategies on P
runoff from winter-spread manure.
- Exploration of the seasonal variation in the emission of greenhouse
and other gases from manure.
- Education Needs:
- Include in nutrient management planning activities the identification
of high, medium, and low manure application risks.
- Promote the Conservation Reserve Enhancement Program (CREP).
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