* Sees fiscal Q4 phosphate volumes at least 2.5 mln tonnes
* Expects fiscal Q4 potash volumes at least 1.9 mln tonnes
* USDA corn, wheat forecasts positive indicators
* Shares dip 1 percent
NEW YORK, March 31 (Reuters) - Fertilizer producer Mosaic Co (MOS.N) expects to sell more phosphate and potash fertilizer this fiscal quarter compared with its third fiscal quarter.
The company posted a spike in quarterly profit on Wednesday, but revenue fell short of Wall Street expectations.
Several operational challenges also dented quarterly results. [ID:nN30185905]
Mosaic expects phosphate volumes to grow sequentially 5.4 percent to at least 2.5 million tonnes, the company told analysts in a conference call on Thursday.
In the company's growing potash business, volumes should grow 2 percent, Mosaic said.
The U.S. government expects farmers to plant slightly more corn and wheat this year than analysts and traders had expected. [ID:nN31242742] [ID:nDATVEE7DE]
Shares of Mosaic fell 1 percent to $79.64 in afternoon trading.. (Reporting by Ernest Scheyder; Editing by Derek Caney)