Asia must reform its water use to feed 1.5 billion extra people by 2050, says a new report.
Asian farmers need to modernise their irrigation methods
The authors warn that without big changes to irrigation many nations will have to import food.
The report says that 94% of suitable land in South Asia is already being used for growing food.
According to their computer model the continent could obtain three quarters of the additional food it needs with better irrigation systems.
The report will be presented on Tuesday to the World Water Week conference in Stockholm.
The study was carried out by the International Water Management Institute and the United Nations Food and Agriculture Organization (FAO).
They outline three options for meeting the food needs of Asia's population.
The report warns that the first option is too politically risky and the second is impossible as suitable land is already in use in many areas.
Lead author Aditi Mukherji of the International Water Management Institute said: "Today, the option of expanding irrigated land area in Asia to feed a growing population is becoming increasingly problematic due to land or water constraints6（系统规定参数）."
The report recommends modernising the region's large scale irrigation systems which rely on surface water but have fallen into disrepair（破损，失修） through lack of investment.
Another suggestion is for governments to help individual farmers use cheap pumps to extract ground water for irrigation.
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