1Institute of Cash Crops，Hubei Academy of Agricultural Sciences，Wuhan 430064，Hubei，China；2Wuhan Zhongnong South Science and Technology Co.，Ltd.，Wuhan 430000，Hubei，China；3Enshi Academy of Agricultural Sciences，Tujia Miao Nationalities Autonomous Prefection，Enshi 445000，Hubei，China
Abstract：The Selenium（Se） absorption characteristics of 4 lettuce varieties were studied by applying Se （0.2 g · m-2）in soil as exogenous selenium．The results showed that the selenium contents of 4 lettuce varieties were‘Fangni’＞‘Luoshalyu’＞‘Naiyouhong’＞‘Xiangyehong’．Taking‘Fangni’as research object，this experiment adopted 3 exogenous selenium adding methods，including applying selenium to soil （0，0.02，0.2，2，20 g · m-2），conducting foliar application（0，50，100，200 mg · kg-1） and soaking seed with selenium（0，50，100 mg · kg-1）；and studied the effects of different applying methods on yield，quality，selenium content and selenium conversion rate of lettuce．The results showed that with the increase of exogenous selenium concentration，the lettuce yield increased first then decreased．While，the total selenium content of lettuce increased significantly．Selenium conversion rate first increased，then decreased，but was always over 80%．After comprehensively comparing the effects of soil application of selenium，foliar spraying and seed soaking with selenium on yield，selenium content and selenium conversion rate of lettuce，we recommended that foliar application of selenium at the rate of 100 mg · kg-1 was the best way and appropriate amount for adding exogenous selenium to lettuce．
