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.

由于地下水位下降，灌溉井干涸，居于世界之首的中国小麦产量，已经从1997年1.23亿吨的峰值下降了8%。

youdao

I decided to crop the picture just above the water line.

我决定把这张照片裁切到刚刚高于水位线的地方。

《柯林斯英汉双解大词典》

You are basically extending your crop production on borrowed water.

那么你就只能靠借水才能维持作物生产。

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Scientists are working to develop crop plants that can reduce the amount of water used for agriculture.

VOA: special.2009.03.23

"Kids really get engaged in science in the garden where it's a kind of fun activity where they're collecting data and seeing how different temperatures will change the amount of water that's needed by a crop, so the science concepts come easily."

VOA: special.2011.06.14

"We can produce one crop and harvest that, turn around and water the stubble and have a second crop."

VOA: standard.2010.07.29

It improves water retention, crop yield, nutrient value, taste, color, texture and disease resistance.

FORBES: Potty For Potash, Saskatchewan Not Seduced By BHP Now��

Acute water shortages cause death through waterborne diseases, and dwindling water supplies reduce crop yields.

BBC: Analysis: Poor management of resources

Sugar cane, which is planted in the summer, is a water-intensive crop and farmers may shift to other crops temporarily, industry executives said.

WSJ: Drought to Hit Sugar Cane Output in Maharashtra