* Potash Corp down more than 4 percent
* Shares of Agrium and Mosaic also lower
TORONTO, Aug 17 (Reuters) - Shares of North American fertilizer companies tumbled on Monday amid a broader selloff in equity markets and declining grain prices.
Chicago Board of Trade soybeans dived early Monday on technical weakness and prospects for a record-large U.S. soy crop amid ideal growing conditions. Corn and wheat followed the weakness in soybeans. [ID:nN17226274]
CF shares were down 4.4 percent in New York, while Terra and Intrepid fell 3 percent and 5.4 percent, respectively. (Reporting by Euan Rocha; editing by Rob Wilson)