Abstract:

To identify the rice varieties with the high-yield and low-cadmium content, 10 early rice and 12 late rice varieties were selected as materials in Xinyu City, Jiangxi Province. Field plot experiments were conducted to compare the differences in cadmium absorption, accumulation and enrichment of different rice varieties in mildly cadmium contaminated farmland. The rice yield, cadmium content, enrichment coefficient and transport coefficient in brown rice were measured. Results demonstrated that the cadmium content in brown rice of different rice varieties was significantly different (P<0.05). The cadmium content in brown rice of early rice was 0.11-0.25 mg·kg^-1, and the cadmium content in brown rice of late rice varieties was 0.05-0.21 mg·kg^-1. The national limit standard value (0.20 mg·kg^-1) was exceeded by some rice varieties, including Qiliangyou 1639, Lingliangyou 171 and Xing'anxiangzhan. Cadmium enrichment coefficient of brown rice of early rice and late rice were 0.26-0.57 and 0.17-0.73, respectively; transport coefficient of bush-brown rice of early rice and late rice were 1.12-2.62 and 0.26-2.75, respectively. The enrichment and transit coefficients were commensurate with the cadmium level in brown rice. The yield of various rice cultivars ranged from 6.30 to 11.69 t·hm^-2. Qiliangyou 1639 and Yongyou 4949 were the early and late rice types with the highest yield, respectively. Taking into account brown rice's cadmium accumulation and rice yield, Lingliangyou 47, an early rice variety, and Yongyou 4949, a late rice variety, were chosen as high-yield and low-cadmium varieties in Xinyu City by multi-objective cluster analysis.

Key words: rice variety, cadmium, brown rice, yield, enrichment coefficient