Exhibit 32.2

Certification Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 
906 of the Sarbanes-Oxley Act of 2002

In connection with the Report of Terra Industries Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2009 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned Chief Financial Officer of the Company hereby certifies, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002 that based on his best knowledge:

1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and

2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of and for the periods covered in the Report.

/s/ DANIEL D. GREENWELL Daniel D. Greenwell
Senior Vice President and Chief Financial Officer
(Principal Financial Officer)

Dated: July 24, 2009

The certification set forth above is being furnished as an exhibit solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and is not being filed as part of the Form 10-Q or as a separate disclosure document of the company or the certifying officer.

A signed original of this written statement required by Section 906 has been provided to the registrant and will be retained by the registrant and furnished to the Securities and Exchange Commission or its staff upon request.