China, the world's top producer of rice and wheat, is seeking to cap the use of chemical fertilizer and pesticides that have helped to contaminate large swathes of its arable land and threaten its ability to keep up with domestic food demand.

 

More than 19 percent of soil samples taken from Chinese farmland have been found to contain excessive levels of heavy metals or chemicals waste.  In central Hunan province, more than three quarters of the rice fields have been contaminated, government research has shown.

 

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