Potash Corp. of Saskatchewan (NYSE: POT) is expected to report Q4 earnings on Jan. 31. Here's what Wall Street wants to see:

The 10-second takeaway
Comparing the upcoming quarter to the prior-year quarter, average analyst estimates predict Potash Corp. of Saskatchewan's revenues will contract -2.7% and EPS will wane -25.6%.

The average estimate for revenue is $1.73 billion. On the bottom line, the average EPS estimate is $0.58.

Revenue details
Last quarter, Potash Corp. of Saskatchewan booked revenue of $1.99 billion. GAAP reported sales were 9.3% lower than the prior-year quarter's $2.19 billion.

Source: S&P Capital IQ. Quarterly periods. Dollar amounts in millions. Non-GAAP figures may vary to maintain comparability with estimates.

EPS details
Last quarter, EPS came in at $0.74. GAAP EPS of $0.74 for Q3 were 21% lower than the prior-year quarter's $0.94 per share.

Source: S&P Capital IQ. Quarterly periods. Non-GAAP figures may vary to maintain comparability with estimates.

Recent performance
For the preceding quarter, gross margin was 46.6%, 500 basis points worse than the prior-year quarter. Operating margin was 40.3%, 680 basis points worse than the prior-year quarter. Net margin was 32.4%, 530 basis points worse than the prior-year quarter.

Looking ahead

The full year's average estimate for revenue is $7.63 billion. The average EPS estimate is $2.81.

Investor sentiment
The stock has a five-star rating (out of five) at Motley Fool CAPS, with 4,790 members out of 4,954 rating the stock outperform, and 164 members rating it underperform. Among 891 CAPS All-Star picks (recommendations by the highest-ranked CAPS members), 865 give Potash Corp. of Saskatchewan a green thumbs-up, and 26 give it a red thumbs-down.

Of Wall Street recommendations tracked by S&P Capital IQ, the average opinion on Potash Corp. of Saskatchewan is outperform, with an average price target of $52.57.

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