Summary and Implications
Swine manure or commercial fertilizer had been fall applied for the prior year(s) crop. Late spring soil nitrate tests and crop yield for the current year were collected to determine the value of nitrogen carryover.
Iowa State University
Brenneman, L. Gregory and Van Dee, Kevin
"Nitrogen Carryover from Swine Manure,"
Animal Industry Report:
AS 651, ASL R2042.
Available at: http://lib.dr.iastate.edu/ans_air/vol651/iss1/51