RISING global food demand will push up prices 10-40 percent over the coming decade and governments need to boost investment to increase farm production, a forecast by two international agencies said yesterday.

Growth in food production has slowed over the past 10 years even as increasing incomes in developing countries boosted consumption, according to the UN Food and Agriculture Organization and the Organization for Economic Cooperation and Development.

"We're observing slower growth in production and productivity, and that is a concern," Merritt Cluff, an FAO economist, said at a news conference.

Governments need to find ways to give farmers access to technology to increase output and get more of their crops to market, the agencies said in a report, "Agricultural Outlook 2013-2022."

Prices may rise 10-40 percent over the coming decade, with the cost of meat rising faster and that of grains more slowly, said Ken Ash, director-general of the OECD's trade and agriculture division.

"We would urge governments around the world to begin to shift and to shift quickly from old-style policies to a greater focus on productivity and innovation," Ash said. "If we carry on blissfully as if nothing has changed in the world, there could be a problem."

Higher prices will have their biggest impact in developing countries where some families spend up to 60 percent of their incomes on food, Cluff said.

China's imports of meat and oilseeds are forecast to grow as its increasingly prosperous consumers spend more on food, the agencies said.

The country has pursued self-sufficiency in production of rice, wheat and other grain but for soybeans and other oilseeds relies on imports from the United States, Brazil and other countries.

Imports of oilseeds may rise by 40 percent over the next 10 years, accounting for 59 percent of global trade in oilseeds, while dairy imports would rise 20 percent, the OECD and FAO said.

China should remain self-sufficient in its main crops but for other products its sheer size "will keep markets on edge over the next decade," Cluff said.

Food consumption in developing countries has grown by up to 30 percent a year over the past decade as incomes rose, while consumption in developed countries changed little, the agencies said.

Investment in farming has fallen in recent decades due to a long-term decline in commodity prices and has yet to rebound despite price spikes since 2008, the agencies said.