One source says about 70 percent — a huge majority! — here’s the quote: “
Food and agriculture are the largest consumers of water, requiring one hundred times more than we use for personal needs. Up to 70 % of the water we take from rivers and groundwater goes into irrigation, about 10% is used in domestic applications and 20% in industry.”
Another site confirms this:
“Almost 70% of all available freshwater is used for agriculture. Overpumping of groundwater by the world’s farmers exceeds natural replenishment by at least 160 billion cubic metres a year. It takes an enourmous amount of water to produce crops: one to three cubic metres to yield just one kilo of rice, and 1,000 tons of water to produce just one ton of grain. “
and finally wikipedia gives us this: “Agricultural: It is estimated that 69% of worldwide water use is for irrigation, with 15-35% of irrigation withdrawals being unsustainable. In some areas of the world irrigation is necessary to grow any crop at all, in other areas it permits more profitable crops to be grown or enhances crop yield. Various irrigation methods involve different trade-offs between crop yield, water consumption and capital cost of equipment and structures.” This supporting fact took a while to find and it came from a great wiki article titled: Water Resources. (you’ll have to copy and paste this one into your URL bar — but it’s worth taking a look at it — http://en.wikipedia.org/wiki/Water_resources) also this one http://en.wikipedia.org/wiki/Agriculture
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