Just bought a used Raven Accu-Flow NH3 system.  I already had the Viper.  I'm planning on doing VR NH3.  What is your methodology?  What do you base your maps off of?  If I have multiple years of yield data, how do I decide which is the best map to base my prescription off of? 

I plan on zone sampling the field based on cotton yield data from my Ag Leader.  Maybe split the field into 3 or 4 colors/zones for the soil sampling and resulting N requirement?

Just thought I'd vent and see if I can get some ideas on your VR NH3 programs.

Thanks for your time,

JD