irrigation是什么意思？

Donna helped the people of the village to organize an irrigation project, and she also advised them on planting corps that didn't require much water.

As water tables have fallen and irrigation wells have gone dry, China's wheat crop, the world's largest, has declined by 8% since it peaked at 123 million tons in 1997.

millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.

The biggest challenge here is irrigation, which consumes 70% of the world's fresh water.

Better irrigation can dramatically improve crop yield and about 40% of the world's food supply is currently derived from irrigated land.

However, water used in irrigation is often sourced unsustainably

Food security and fortunes depend on sufficient rain, and nowhere more so than in Africa, where 96% of farmland depends on rain instead of the irrigation common in more developed places.

In poor, dry regions, untreated waste water is the only viable irrigation source to keep farmers in business.

Irrigation is the primary agricultural use of human waste in the developing world.

Most of these operations draw irrigation water from local rivers or lakes.

When this water is used for agricultural irrigation, farmers risk absorbing disease-causing bacteria, as do consumers who eat the produce raw and unwashed.