X0203 3 2010-04-05 1 0000879575 TERRA NITROGEN CO L P /DE TNH 0001418975 Hoker Richard A C/O CF INDUSTRIES HOLDINGS, INC. 4 PARKWAY NORTH, SUITE 400 DEERFIELD IL 60015 0 1 0 0 VP and Corporate Controller /s/ Richard A. Hoker 2010-05-03