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NE Kansas | Iowa State says that you will need 0-30 lbs of nitrogen for first year after established alfalfa: Here is the article from Iowa State:
http://www.ipm.iastate.edu/ipm/icm/2001/1-29-2001/makenpay.html
Here is a research paper from Iowa State:
www.agronext.iastate.edu/soilfertility/info/NERF_AnnRepo2004_Nrotation_Publ-2005.pdf
I talked to a farmer that wanted to tear up and alfalfa field and plant corn. He is going to use 50 units of N per acre. I have to admit that is more but I would say the grass covered about 40-50% of the alfalfa field. That does not provide any N to the next crop.
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Hey!! Hay Wilson
