Abstract: The experiment was carried out with topping in different stage and in different site to investigate the sesame yield，quality and correlation character in 2008 in Henan. The results indicated that: there were significantly higher yield of the topping treatment after sprouted 50， 70 and 80 d than no-topping(CK) (5. 38%－10. 61%) and significantly lower yield of the topping treatment after sprouted 20，30 and 40 d than no-topping(CK) (39. 05%－49. 70%) . Topping could increase yield in late stage and decrease yield in early stage，in the same time，yield increased with the latitude value increasing if topping in early stage in Henan ecoregion. The quality analyzing indicated that topping would help protein to form and accumulate in early stage and crude fat form and accumulate in late stage. Photosynthetic rate，Solar energy use efficiency and Water use efficiency of topping in early stage was enhanced 18. 11%，10. 62%，23. 08% and topping in late stage was enhanced 3. 00%，2 . 13%，7. 69% than those of no-topping (CK) in grain-filling late stage.

Key words: Sesame, Topping-stage, Yield, Quality, Photosynthesis property

CLC Number: 

• S6.3