It's been a tough year for Mosaic (NYSE:MOS) investors, with the stock shedding as much as 13% over the past six months.

MOS Chart

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With the fertilizer producer set to announce its second-quarter numbers this week, investors are no doubt hoping for some good news in the earnings report that could put a stop to the slide in its share price.

The consensus earnings per share estimate stands at $0.93 a share, representing a sharp improvement over the $0.70 per share Mosaic earned in Q2 2014. While an earnings surprise could drive Mosaic stock up this week, whether the company delivers on a few important metrics will be the key to its growth in the near future. Check out the following slideshow to find out the three important metrics you can't miss in Mosaic's upcoming earnings report.