Terra Houston Ammonia, Inc.

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Post-effective amendment to an automatic shelf registration statement

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Free Writing Prospectus

Prospectus Supplement for Primary Offering

Automatic Shelf Registration

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Correspondence with the SEC

Correspondence with the SEC

Registration statement under Securities Act of 1933 (amendment)

Correspondence with the SEC

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933