--Mosaic second-quarter earnings climb on tax benefit

--Phosphate and potash fertilizer sales decline

--India demand poses challenge

--Shares rise as results beat expectations

A slowdown in fertilizer shipments to Asia weighed on Mosaic Co.'s (MOS) fiscal second-quarter earnings, although overall profit edged higher on a significant tax benefit.

The Minnesota-based fertilizer company, one of the world's largest potash and phosphate fertilizer producers, reported second-quarter operating earnings fell 30%. The decline was due mainly to lower phosphate volumes and prices, the company said.

Despite that pressure, net profit climbed 0.8% thanks to an income-tax benefit of 42 cents a share, and the results beat analyst expectations. Shares were recently up 2.6% to $58.30.

Even amid strong U.S. demand, the market for potash and fertilizer has been under pressure in recent months by prolonged contract negotiations with buyers in India and China, who have insisted on lower prices. Although China recently agreed to a new potash contract that Chief Executive Jim Prokopanko said should revive the market, short-term challenges remain, he said.

"The market is really a tale of two hemispheres," Mr. Prokopanko said in a conference call with investors.

The company slashed its global potash shipment forecast to 55 million to 57 million tons for 2013, down from a prior forecast of 58 million to 60 million, and cut its phosphate shipment forecast to 63 million to 65 million tons, down 1 million. The company in November had cut its second-quarter potash and phosphates sales volume expectations, pointing to weaker demand.

Still, the company has said it believes that customer demand is simply delayed, adding that the long-term prospects for fertilizer remains positive.

Historically high crop prices have compelled farmers to plant as many acres as possible, and the U.S. fall application season was stronger than expected, Mr. Prokopanko said.

Farmers "have these high grain and oilseed prices clearly in focus," he said.

Mr. Prokopanko and other fertilizer executives have pointed to a growing world population and improved diets driving demand for grain, and hence fertilizer, for many years to come. But some analysts say that the market is becoming saddled with too much fertilizer production capacity.

In the short term, Mr. Prokopanko added the phosphate market could get a boost from dwindling Mississippi River levels, which could cause a spike in demand as customers try to secure fertilizer ahead of potential river transportation shutdowns.

In the latest period, phosphate net sales--the company's biggest source of revenue--were down 19% at $1.8 billion as sales volume shrank about 6.3%. Net sales in the potash segment fell 7% to $780 million as volume sank about 17%.

For the quarter ended Nov. 30, Mosaic reported a profit of $628.8 million, or $1.47 a share, up from $623.6 million, or $1.40 a share, a year earlier.

Net sales sank 16% to $2.54 billion, driven by lower phosphate and potash volumes and lower phosphate prices.

Analysts polled by Thomson Reuters most recently projected earnings of 93 cents a share on revenue of $2.57 billion.

Gross margin narrowed to 26.7% from 29.2%.

Write to Ian Berry at ian.berry@dowjones.com and Ben Fox Rubin at ben.rubin@dowjones.com

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