Websites

Nitrogen from legume crops:
University of Wisconsin Integrated Crop and Pest Management page provides a table for calculating nitrogen credits from legumes at: http://ipcm.wisc.edu/pubs/cards/a3591.htm

Nitrogen from manure:
Colorado State University Fact Sheet 0.560 Cattle Manure Application Rates discusses value of manure and how to calculate rates: http://www.ext.colostate.edu/PUBS/CROPS/00560.html

Using chlorophyll meters to manage nitrogen:
University of Nebraska NebGuide G93-1171-A Using a Chlorophyll Meter to Improve N Management:
http://www.ianr.unl.edu/pubs/soil/g1171.htm

Tips on improving nitrogen and irrigation management:
Crop Production with Limited Water
http://www.colostate.edu/Depts/SoilCrop/extension/Newsletters/2003/Drought/index.html

Daily Crop Water Use (ET) Reports
http://www.coagmet.com

Various issues of this newsletter provide information on these topics. See the index at :
http://www.colostate.edu/Depts/SoilCrop/extension/Newsletters/news.html

Various publications from University of Nebraska Institute of Agriculture and Natural Resources address this topic. See the index at: http://www.ianr.unl.edu/pubs/water/index.htm#WATER

Various articles at the University of Nebraska CropWatch Newservice address this topic.
See the index at: http://cropwatch.unl.edu/

Soil Testing
Colorado State University Fact Sheet 0.500
Soil sampling at: http://www.ext.colostate.edu/PUBS/CROPS/00500.html

Colorado State Unviersity Fact Sheet 0.501
Soil testing at: http://www.ext.colostate.edu/PUBS/CROPS/00501.html

Colorado State Unviersity Fact Sheet 0.502
Soil test explanation at: http://www.ext.colostate.edu/PUBS/CROPS/00502.html

Colorado State Unviersity Fact Sheet 0.520 Selecting and analytical Laboratory at:
http://www.ext.colostate.edu/PUBS/CROPS/00520.html

Colorado State University publications on CSU fertilizer recommendations, nitrogen management, and related topics see index at : http://www.ext.colostate.edu/PUBS/CROPS/pubcrop.html