Abstract:Using eight ratoon rice varieties, Xiangzaoxian 45(V1), Yliangyou 911(V2), Hengliangyou Jinnongsimiao (V3), Yongyou 4149(V4), Yliangyou 9918(V5), Fengliangyou 464(V6), Longliangyou 1988(V7) and Liangyou 121 (V8) as materials, a field experiment was carried out in 2021 to compare the differences in yield and Cd absorption, translocation and accumulation characteristics among the 8 different ratoon rice varieties. The results showed that V5 had the highest yield in both the first and ratoon crops, with actual yields of 6.81 t/hm2 and 5.62 t/hm2, respectively. The main factor affecting yield was the number of grains per ear. V3 showed the highest Cd content in brown rice of the first and ratoon crops, followed by V3, V5, V1, V6, V8, V7, V2 and V4. The main reason was that there were significant differences in Cd bioaccumulation factors among varieties. In the first crop, except for V3 and V5, the Cd content of brown rice of other varieties was lower than 0.2 mg/kg; in the ratoon crop, the Cd content of brown rice of V2, V4, V7, and V8 was lower than 0.2 mg/kg. The Cd accumulation in the rice panicle in the first and ratoon crops was higher in V3 and V5, and lower in V2 and V4. The results of correlation analysis showed that the Cd content in brown rice and the Cd accumulation in the panicle were extremely significantly positively correlated with the Cd content in various organs of the plant(roots, stems, leaves and stubble) and the Cd bioaccumulation factors of brown rice, but were not significantly correlated with the Cd translocation factors of various organs. In addition, the Cd content of brown rice in the first crop of each variety was lower than that in the ratoon crop. The Cd accumulation in the panicle of V3, V5 and V6 was significantly higher in the first crop than that in the ratoon crop, while the other varieties was on the contrary. Taking into account the rice yield and Cd content in brown rice, Yongyou 4149(V4) is a variety with a lower risk of exceeding the Cd standard for rice fields contaminated with Cd.