Rice, a staple food for about 3 billion people, is becoming a precious commodity as a result of rising demand -- a reality that's prompting some agriculture watchers to ask whether global grain producers will be able to keep the world adequately supplied amid solid emerging market economic growth.

China, Egypt, Vietnam, and India, which represent about one-third of global rice exports, curbed sales this year, and Indonesia did so as well, Bloomberg News reported Monday. Grain and food demand is increasing at above-trend rates due to solid economic growth in emerging markets. These regions are experiencing expanding middle classes -- a factor that historically has almost always led to rising per capita food consumption in the country where the growth occurred.

As a result, the price of rice and other commodities has soared -- rice hit $21 per 100 pounds on Monday, Bloomberg News reported -- and governments may face increased social unrest, given the pivotal role rice plays in many developing nations.

First oil. Then copper, then lumber, and coal. And now grain.

The solid economic growth in the world's emerging markets that's caused oil / coal and commodities prices to surge is now fully hitting the grain market.

So much so, that some food producers are calling on the U.S. government to restrict exports due to soaring prices for grains they use to make cereal and other foods. Meanwhile, some farmers are asking the U.S. Government to ease restrictions to enable farmers to plant more acres, The Wall Street Journal reported Thursday [Subscription required].

For food producers, the issue involves limiting a major operating cost. During the past year, spring wheat has risen to an astounding $17.63 per bushel, up from about $4.90 a year ago. Flour, which used to cost about $15 per 100 pounds, now sells for about $45-48 per 100 pounds. Food producers say prices are increasing so fast, they can't pass along price increases quick enough to keep up.

The Mosaic Company (NYSE: MOS) volatility elevated as MOS at record high into EPS.

MOS, a producer and marketer of concentrated phosphate and potash crop nutrients, was spun out of Cargill in 2004. MOS is recently up 10 cents to $53.35. MOS is expected to report earnings per share (EPS) on October 9th. MOS October option implied volatility of 52 was above its 26-week average of 40 according to Track Data, suggesting larger price risks.

Potash Corp./Saskatchewan (USA) (NYSE: POT) volatility elevated as POT at record high on grain price rally:

POT, the world's largest fertilizer enterprise, by capacity, was recently up $1.43 to $105.58. SBSH says "Potash shortages possible in 2008." SBSH goes on to say "we think high prices for wheat and corn will send a signal to farmers in developing countries like China to increase Potash application rates." POT over all option implied volatility of 46 is above its 26-week average of 39 according to Track Data, suggesting larger price risks.

Option update provided by Stock Specialist Paul Foster of theflyonthewall.com.