In this photot taken on March 24, 2009, Cheng Jianjun(L), director of vegetable office in Chamdo Prefecture showes Li Qinxiang how to plant lettuce in greenhouses. [Xinhua photo]
![In this photot taken on March 24, 2009, Cheng Jianjun(L), director of vegetable office in Chamdo Prefecture showes Li Qinxiang how to plant lettuce in greenhouses. [Xinhua photo]](http://images.china.cn/attachement/jpg/site1007/20090326/001109b42f730b35495218.jpg "In this photot taken on March 24, 2009, Cheng Jianjun(L), director of vegetable office in Chamdo Prefecture showes Li Qinxiang how to plant lettuce in greenhouses. [Xinhua photo]")