You apply 18,000 gallons of your very run of the mill manure…

You apply 18,000 gallons of your very run of the mill manure to your crop of corn pre-plant, incorporating it after application.  You forgot however how much starter you used when you put this rate on.  You check the NPM Factsheet and see that you would have 7 lbs of N/1000 gallons in your incorporated manured field.  How many lbs of N are from the manure?