Liang Yiwen/Shanghai Daily news

By 2010, all the city's major agriculture products will be included in a source-tracing system to ensure their quality. The system will enable a quality watchdog to trace each product back to its producer, agriculture commission officials said yesterday.

Detailed information will be included in the system such as the place and the time the food is grown, what kind of fertilizer was used and when it was applied, according to Sun Lei, director of the Shanghai Agriculture Commission.