Presentation on theme: "Jane Frankenberger Purdue University. Opportunity for agreement -- Even people with widely divergent views can agree on numbers drawn from the literature."— Presentation transcript:
Jane Frankenberger Purdue University
Opportunity for agreement -- Even people with widely divergent views can agree on numbers drawn from the literature.
Estimate baseline condition Identify practices that have high benefits Assess load reductions possible Create plausible scenarios and assess benefits
University and ARS researchers State Department of Agriculture scientists State regulatory agency scientists NRCS, Agricultural organizations, Environmental groups Even if some have an agenda, assessment based on published research only.
Sometimes we focus on the gaps more than what is known. (We will always need to polish the hubcaps, but can we focus on the engine in the driveway?)
If others should be added to the list, evidence needs to be provided. If the effect should be assumed to be somehow different within a system of practices, evidence should be provided.
Let’s move away from lumping them as “nutrients”. It confuses. To address nitrogen, we need to focus on the flow through tile drains. The practices are not as effective as we wish they were at reducing nitrate (Table 1, page 5) except for changing land use.
All fertilizer applied at MRTN Rate 60% of corn/soybean has cover crops 27% treated with wetland 60% of drained land has bioreactor 42% N reduction; 30% P reduction All fertilizer applied at MRTN Rate 95% of corn/soybean has cover crops 34% in two MLRAs treated with wetland 5% land retirement 42% N reduction; 50% P reduction daunting, but not impossible
Major Land Resource Areas Ecoregion (Level 3 or 4) HUC 6 or 8 Soil parent material, or drainage class?
Only monitoring data? Only our state and surrounding states? Peer-reviewed literature only?
Use the Iowa or Minnesota assessment, just changing numbers? Use SPARROW? Other?
a few (bad) actors are the problem just targeting a few fields will solve most of the problem A single type of practice or system of practices (edge of field denitrification, no-till, soil health) can solve the problem the response will take a long time (decades?)
A state-level nutrient reduction strategy can: Clarify what it is that we know. Expand the “we” in “we know”. Provide a broadly-agreed-on foundation for a nutrient reduction strategy that will be developed in our states.