Watershed Achievements Report
wq-cwp8-18
wq-cwp8-18
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Statewide <strong>Watershed</strong> <strong>Achievements</strong> <strong>Report</strong> 2015<br />
Planning Tool for <strong>Watershed</strong> Scale<br />
Surface Water Nutrient Reduction<br />
The University of Minnesota previously developed a<br />
spreadsheet tool for estimating watershed nitrogen<br />
reductions to surface waters when combinations of BMPs<br />
are adopted, referred to as the “<strong>Watershed</strong> Nitrogen<br />
Reduction Planning Tool” or NBMP.xlsm. This project<br />
developed a similar spreadsheet tool for estimating<br />
watershed phosphorus reductions to surface waters<br />
when one or more BMPs are adopted, along with making<br />
improvements in the previously-developed nitrogen<br />
tool. The new tool is referred to as the “<strong>Watershed</strong><br />
Phosphorus Reduction Planning Tool” or PBMP.xlsm.<br />
The BMPs incorporated into PBMP.xlsm include: 1)<br />
reducing P fertilizer rates on six major crops to target<br />
rates; 2) applying P fertilizer as close to planting as<br />
possible; 3) using reduced tillage; 4) installing riparian<br />
buffers near streams; 5) planting cover crops; 6) adopting<br />
controlled drainage and alternatives to open tile inlets;<br />
and 6) injecting or immediately incorporating manure.<br />
Geological information System (GIS) analysis was<br />
used to determine suitable acreage for each BMP. The<br />
reduction in P load and costs to adopt each of the BMPs<br />
are calculated in the spreadsheet based on user-defined<br />
adoption rates and various research-based assumptions<br />
and parameters.<br />
(increased) the estimate of manure in the current<br />
sheet to be more consistent with other estimates.<br />
Revised the riparian buffer suitable acres data with<br />
new data that accounts for land currently in buffers.<br />
Also, changed the default assumption for land shifted<br />
from fall N application to spring or sidedressed, to<br />
assume that that acreage also has the rate reduced,<br />
even if the rate reduction adoption is less than the<br />
acreage shift adoption rates. Fixed a bug in the<br />
perennial crop value calculations.<br />
Financial information<br />
Funding type: Section 319<br />
Grant amount: $67,002<br />
Final in-kind: $22,501<br />
Contact information<br />
Judy Krzyzek<br />
University of Minnesota<br />
450 McNamara Alumni Center, 200 Oak Street<br />
Minneapolis, MN 55455<br />
612 624 5599<br />
krzyzek@umn.edu<br />
MPCA Project Manager: Dave Wall<br />
Goals<br />
• Add a phosphorus reduction BMP spreadsheet<br />
component to the NBMP tool.<br />
• Improve the nitrogen load reduction estimates in the<br />
current NBMP tool.<br />
Results that count<br />
• A draft version of the PBMP.xlsm spreadsheet has<br />
been developed and is undergoing review and<br />
refinement.<br />
• Added N inhibitor and saturated buffers as BMPs.<br />
Added more detail on the overlap between suitable<br />
acres of riparian buffers, wetlands, and perennial<br />
crops. Made many other small changes. Revised<br />
the documentation. Refined the estimates of corn<br />
yield reductions under current and BMP N rates and<br />
different rainfall scenarios. Fixed a bug in the manure<br />
crediting calculations that affects the individual<br />
watershed loading calculations. Also changed<br />
Minnesota Pollution Control Agency www.pca.state.mn.us 35