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<P style="font-size: 14pt" align="center"><B>UNITED STATES<BR>
SECURITIES AND
EXCHANGE COMMISSION<BR>
<FONT style="font-size: 12pt">Washington, D.C. 20549
</FONT></B>

<P style="font-size: 18pt" align="center"><B>FORM 8-K</B>

<P style="font-size: 12pt" align="center"><B>CURRENT REPORT<BR>
Pursuant to
Section 13 OR 15(d) of The Securities Exchange Act of 1934</B>

<P style="font-size: 10pt" align="center"><B>Date of Report (Date of earliest
event reported): October 23, 2008</B>

<P style="font-size: 24pt" align="center"><B>TERRA NITROGEN COMPANY,
L.P.<BR>
</B><FONT style="font-size: 10pt">(Exact name of registrant as
specified in its charter) </FONT>
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  <TD width="32%">&nbsp;</TD>
  <TD width="1%">&nbsp;</TD>
  <TD width="33%">&nbsp;</TD>
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  <TD width="32%">&nbsp;</TD>
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 <TR valign="bottom">
  <TD style="border-bottom: #000000 1px solid"><B>Delaware</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>033-43007</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>73-1389684</B></TD>
 </TR>
 <TR valign="top">
  <TD>(State or other Jurisdiction of Incorporation)</TD>
  <TD>&nbsp;</TD>
  <TD>(Commission File Number)</TD>
  <TD>&nbsp;</TD>
  <TD>(IRS Employer Identification No.)</TD>
 </TR>

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cellpadding="0" width="100%" border="0">

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  <TD width="49%">&nbsp;</TD>
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  <TD width="49%">&nbsp;</TD>
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  <TD style="border-bottom: #000000 1px solid"><B>Terra Centre<BR>
600 Fourth
Street, P.O. Box 6000<BR>
Sioux City, Iowa</B></TD>
  <TD>&nbsp;</TD>
  <TD style="border-bottom: #000000 1px solid"><B>51102-6000</B></TD>
 </TR>
 <TR valign="top">
  <TD>(Address of Principal Executive Offices)</TD>
  <TD>&nbsp;</TD>
  <TD>(Zip Code)</TD>
 </TR>

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<P style="font-size: 10pt" align="center">Registrant&#8217;s telephone number,
including area code: <B>(712) 277-1340</B>
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  <TD style="border-bottom: #000000 1px solid" nowrap><B>&nbsp;</B></TD>
 </TR>
 <TR>
  <TD nowrap>(Former name or former address if changed since last report.)</TD>
 </TR>

</TABLE>


<P style="font-size: 10pt" align="left">Check the appropriate box below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions:

<P style="font-size: 10pt" align="left"><FONT face="Wingdings">o</FONT> Written
communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425)<BR>
<BR>
<FONT face="Wingdings">o</FONT> Soliciting material pursuant
to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)<BR>
<BR>
<FONT
face="Wingdings">o</FONT> Pre-commencement communications pursuant to Rule
14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))<BR>
<BR>
<FONT
face="Wingdings">o</FONT> Pre-commencement communications pursuant to Rule
13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))<BR>


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<P style="font-size: 10pt" align="justify"><B>ITEM 2.02 RESULTS OF OPERATIONS
AND FINANCIAL CONDITION.</B>

<P style="font-size: 10pt; text-indent: 8%" align="justify">On October&nbsp;23,
2008, Terra Nitrogen Company, L.P. issued a press release setting forth Terra
Nitrogen Company, L.P.&#8217;s third quarter 2008 earnings and announcing a
cash distribution. A copy of the press release is furnished herewith as
Exhibit&nbsp;99.1.

<P style="font-size: 10pt" align="justify"><B>ITEM 9.01 FINANCIAL STATEMENTS
AND EXHIBITS.</B>

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  <TD nowrap align="left" width="3%">(c)</TD>
  <TD width="1%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">Exhibits</DIV>
</TD>
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  <TD nowrap align="left" width="3%">99.1</TD>
  <TD width="1%">&nbsp;</TD>
  <TD>
<DIV style="text-align: justify">Press Release issued October&nbsp;23, 2008
reporting third quarter results and announcing a cash distribution.</DIV>
</TD>
 </TR>

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<P style="font-size: 10pt" align="center"><B>SIGNATURES</B>

<P style="font-size: 10pt; text-indent: 4%" align="justify">Pursuant to the
requirements of the Securities Exchange Act of 1934, as amended, the Registrant
has duly caused this report to be signed on its behalf by the undersigned,
thereunto duly authorized.
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  <TD>&nbsp;</TD>
  <TD valign="top" align="left">TERRA NITROGEN COMPANY, L.P.</TD>
 </TR>

 <TR valign="bottom">
  <TD>&nbsp;</TD>
  <TD valign="top" align="left">By: Terra Nitrogen GP Inc.<BR>
Its:  General Partner</TD>
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<TR><TD>&nbsp;</TD></TR>


 <TR valign="bottom">
  <TD>&nbsp;</TD>
  <TD valign="top" align="left" style="border-bottom: 1px solid #000000">/s/ John W. Huey</TD>

 <TR valign="bottom">
  <TD>&nbsp;</TD>
  <TD valign="top" align="left"><I>John W. Huey</I><BR><I>Vice President, General Counsel
and Corporate Secretary</I></TD>
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<P style="font-size: 10pt" align="justify">Date: October&nbsp;23, 2008

<P style="font-size: 10pt" align="center">&nbsp;

<P style="display: none; font-size: 10pt" align="center">2
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{"company-data": {"conformed-name": "TERRA NITROGEN CO L P /DE", "cik": "0000879575", "assigned-sic": "2870", "irs-number": "731389684", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "033-43007", "film-number": "081136661"}, "business-address": {"street1": "TERRA CENTRE 600 FOURTH STREET", "street2": "PO BOX 6000", "city": "SIOUX CITY", "state": "IA", "zip": "51102-6000", "phone": "7122771340"}, "mail-address": {"street1": "TERRA CENTER 600 FOURTH STREET", "street2": "PO BOX 6000", "city": "SIOUX CITY", "state": "IA", "zip": "51102-6000"}}
Filed by Bowne Pure Compliance
UNITED STATES
SECURITIES AND
EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to
Section 13 OR 15(d) of The Securities Exchange Act of 1934
Date of Report (Date of earliest
event reported): October 23, 2008
TERRA NITROGEN COMPANY,
L.P.
(Exact name of registrant as
specified in its charter)
Delaware
033-43007
73-1389684
(State or other Jurisdiction of Incorporation)
(Commission File Number)
(IRS Employer Identification No.)
Terra Centre
600 Fourth
Street, P.O. Box 6000
Sioux City, Iowa
51102-6000
(Address of Principal Executive Offices)
(Zip Code)
Registrant's telephone number,
including area code:
(712) 277-1340
(Former name or former address if changed since last report.)
Check the appropriate box below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions:
o
Written
communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425)
o
Soliciting material pursuant
to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule
14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule
13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
ITEM 2.02 RESULTS OF OPERATIONS
AND FINANCIAL CONDITION.
On October 23,
2008, Terra Nitrogen Company, L.P. issued a press release setting forth Terra
Nitrogen Company, L.P.'s third quarter 2008 earnings and announcing a
cash distribution. A copy of the press release is furnished herewith as
Exhibit 99.1.
ITEM 9.01 FINANCIAL STATEMENTS
AND EXHIBITS.
(c)
Exhibits
99.1
Press Release issued October 23, 2008
reporting third quarter results and announcing a cash distribution.
SIGNATURES
Pursuant to the
requirements of the Securities Exchange Act of 1934, as amended, the Registrant
has duly caused this report to be signed on its behalf by the undersigned,
thereunto duly authorized.
TERRA NITROGEN COMPANY, L.P.
By: Terra Nitrogen GP Inc.
Its:  General Partner
/s/ John W. Huey
John W. Huey
Vice President, General Counsel
and Corporate Secretary
Date: October 23, 2008