POTASH CORP. OF SASKATCHEWAN $25 (Toronto symbol POT; Aggressive Growth Portfolio, Resources sector; Shares outstanding: 836.6 million; Market cap: $20.9 billion; Price-to-sales ratio: 3.5; Dividend yield: 5.6%; TSINetwork Rating: Average; www.potashcorp.com) continues to see weak demand and prices for its potash and other fertilizers. In response, the company will suspend production at two of its Saskatchewan mines for one month. That will reduce its 2016 output by 400,000 tonnes; in 2015, it sold 8.8 million tonnes. These latest closures are in addition to the company’s recent decision to shut down its potash mine in Picadilly, New Brunswick. Potash Corp. is still a hold.