The attached pdf shows the details on CropPro's Henry test which measured mineralizable nitrogen inside each zone. The hardest question to answer is how much nitrogen will come available in the crop year. The Henry test provides some insight and answers to this question.
See Zone maps and N results here: http://beyondagronomy.com//cmsFiles/documents/document56e7599f8f443.pdf
CropPro Consulting: http://www.croppro.ca/maps/swat_maps.html