Watershed nitrogen and phosphorus reduction planning tool spreadsheets, last updated on 11/7/17. Note: These are watershed-scale tools intended for an audience of local water resource managers, not farm-level decision tools:
NBMP.xlsm nitrogen tool
PBMP.xlsm phosphorus tool
NP-BMP.xlsm combined nitrogen and phosphorus tool
NBMP documentation (pdf)
PBMP documentation (pdf)
The Air Quality Economic Decision Tool spreadsheet is intended to assist owners and managers of livestock or poultry operations to calculate the costs and benefits of installing technologies to treat odors and gases that could be emitted from the facility. The air quality economic decision tool requires Excel 2007 or later versions. Depending on your security settings, you may have to tell your spreadsheet program that it is okay to open it and enable the content. Supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under Agreement No. 2010-85112-20520. (Requires MS Excel 2007 or later, October 2012.)
For more information, see the federal eXtension page here.