Exhibit 21



SUBSIDIARIES OF

POTASH CORPORATION
OF SASKATCHEWAN INC.





|                                                     |  |                                         
|---------------------------------------------------- |  | ----------------------------------------
|Name of Entity                                       |  | Jurisdiction ofIncorporation orFormation
|101070338 Saskatchewan Ltd.                          |  | Saskatchewan                            
|175360 Canada Inc.                                   |  | Canada                                  
|628550 Saskatchewan Ltd.                             |  | Saskatchewan                            
|4420 Investment LLC                                  |  | Delaware                                
|AA Sulfuric Corporation                              |  | Louisiana                               
|Canpotex Bulk Terminals Limited                      |  | Canada                                  
|Chilkap Resources Ltd.                               |  | Yukon                                   
|Inversiones El Boldo Limitada                        |  | Chile                                   
|Inversiones El Coigüe S.A.                           |  | Chile                                   
|Inversiones El Roble Limitada                        |  | Chile                                   
|Inversiones El Sauce Limitada                        |  | Chile                                   
|Inversiones PCS Chile S.A.                           |  | Chile                                   
|Inversiones RAC Chile Limitada                       |  | Chile                                   
|Minera Saskatchewan Limitada                         |  | Chile                                   
|PCS Administration (USA), Inc.                       |  | Delaware                                
|PCS (Barbados) Holdings SRL                          |  | Barbados                                
|PCS (Barbados) Investment Company Ltd.               |  | Barbados                                
|PCS (Barbados) Shipping, Ltd.                        |  | Barbados                                
|PCS Cassidy Lake Company                             |  | Ontario                                 
|PCS Cassidy Lake Limited                             |  | Canada                                  
|PCS Chile I LLC                                      |  | Delaware                                
|PCS Chile II LLC                                     |  | Delaware                                
|PCS Fosfatos do Brasil Ltda.                         |  | Brazil                                  
|PCS Hammond LLC                                      |  | Delaware                                
|PCS Hungary Holding Limited Liability Company        |  | Hungary                                 
|PCS Industrial Products Inc.                         |  | Delaware                                
|PCS Joint Venture, Ltd.                              |  | Florida                                 
|PCS Jordan LLC                                       |  | Delaware                                
|PCS L.P. Inc.                                        |  | Delaware                                
|PCS LP LLC 2                                         |  | Delaware                                
|PCS Nitrogen Ammonia Terminal Corporation I          |  | Texas                                   
|PCS Nitrogen Ammonia Terminal Corporation II         |  | Delaware                                
|PCS Nitrogen Delaware LLC                            |  | Delaware                                
|PCS Nitrogen Fertilizer, L.P.                        |  | Delaware                                
|PCS Nitrogen Fertilizer Operations, Inc.             |  | Delaware                                
|PCS Nitrogen, Inc.                                   |  | Delaware                                
|PCS Nitrogen LCD Corporation                         |  | Delaware                                
|PCS Nitrogen Ohio, L.P.                              |  | Delaware                                
|PCS Nitrogen Trinidad Corporation                    |  | Delaware                                
|PCS Nitrogen Trinidad Limited                        |  | Trinidad                                
|PCS Phosphate Company, Inc.                          |  | Delaware                                
|PCS Purified Phosphates                              |  | Virginia                                
|PCS Sales (Canada) Inc.                              |  | Saskatchewan                            
|PCS Sales (Indiana), Inc.                            |  | Indiana                                 
|PCS Sales (Iowa), Inc.                               |  | Iowa                                    
|PCS Sales (USA), Inc.                                |  | Delaware                                
|PCS USA LLC                                          |  | Delaware                                
|Pérola S.A.                                          |  | Brazil                                  
|Phosphate Holding Company, Inc.                      |  | Delaware                                
|Potash Corporation of Saskatchewan (Florida) Inc.    |  | Florida                                 
|Potash Corporation of Saskatchewan Transport Limited |  | Saskatchewan                            
|PotashCorp Agricultural Cooperative Society Ltd.     |  | Israel                                  
|PotashCorp Finance (Barbados) Limited                |  | Barbados                                
|PotashCorp (Luxembourg) Finance S.à.r.l.             |  | Luxembourg                              
|Potash Holding Company, Inc.                         |  | Delaware                                
|RAC Investments Ltd.                                 |  | Cayman                                  
|White Springs Agricultural Chemicals, Inc.           |  | Delaware