Nitrogen Use Efficiency, Nitrogen Fertilizers, NUE, Nitrogen and the Environment Nitrogen and Weather                                              
Mesonet, Main Page                                                                                        weather.com  (Agriculture)
A. Sutherland Presentation, January 4, 2007                                        Growing Degree Days Calculator

How to compute the Fractional Water Index                                          Pioneer, GDU 

Mesonet, direct link, Estimate of days from planting to sensing where GDD>0
Oklahoma Ag Weather

Ag Mesonet, Custom Soil Moisture Graphs
Conditions Leading to Outstanding Yields at Lahoma, Oklahoma, 2003
 


World Nitrogen Use Efficiency for Cereal Production is 33%,
Agronomy Journal 91:357                                                                                                                   Nitrogen Use Efficiency, Nitrogen Fertilizers, NUE, Nitrogen and the Environment
Trimble Pocket Sensor, Greenseeker, NDVI, nitrogen