It remains a bumpy ride for PotashCorp. Image source: PotashCorp

Potash Corporation (NYSE: POT) stock had been holding up strong until last week when the company dashed investors' hopes of a recovery by delivering dismal first-quarter results and downgrading its full-year guidance. The stock has lost almost 11% in six days as of this writing, and is now down 50% in one year, under-performing close rivals Mosaic (NYSE: MOS) and Agrium (NYSE: AGU) which have lost about 40% and 19%, respectively.

Interestingly, all three companies lowered their sales volumes outlook in Q1, confirming the deteriorating conditions in fertilizer markets. However, PotashCorp appears to be taking the biggest hit. While Mosaic's Q1 net income declined about 13% year over year, PotashCorp reported a staggering 84% drop in its Q1 earnings. Unfortunately, that wasn't the scariest number from the company's earnings report. You'd be shocked to know how truly dismal PotashCorp's EPS guidance is, or how hard its cash flows have been hit. Click on the slideshow below to learn about the five critical numbers from the earnings report that you can't miss.