Effects of Different Cadmium Concentrations on Yield Formation and Cadmium Content in Brown Rice of Late Rice Varieties with Low Cadmium Absorption
[Objective]To clarify the yield formation and rice cadmium changes of late rice varieties with low cadmium absorption.[Method]In 2022,a comparative experiment was conducted on cadmium low absorption late rice varieties in Sheshan Village,Nijiangkou,Heshan District,Yiyang City,Hunan Province(with a total Cd concentration of 7.28 mg/kg)and Sujiahu Village,Heshan District(with a to-tal Cd concentration of 0.43 mg/kg).Observe changes in growth period,dry matter accumulation,yield,yield composition,and cadmium content in rice.[Result]Two low cadmium absorption varieties,compared to the control variety Wuyou 308,showed a decrease in yield due to cadmium stress.However,the yield of Anliangyou 2 only decreased by 2.8%in high cadmium fields,with higher effective panicles and higher dry matter accumulation and population growth rate in the early stages of growth;Both loca-tions showed significant cadmium reduction effects.At a Cd concentration of 0.43 mg/kg,the cadmium content in brown rice of Anliangyou 2 and Qingliansilmiao was 0.010 and 0.013 mg/kg,respectively,which decreased by 96.15%and 95%compared to the control variety.At a Cd concentration of 7.28 mg/kg,the cadmium content in the brown rice of Anliangyou 2 was 0.21 mg/kg,a decrease of 87.5%compared to the control variety;The cadmium content in the brown rice of Qinglian silk seedlings is 0.19 mg/kg,which is 88.69%lower than the control variety.[Conclusion]Both low cadmium ab-sorption varieties have good cadmium reduction ability and can be safely planted in rice fields with mild cadmium pollution.There is a risk of excessive cadmium content in brown rice when directly planted in high cadmium polluted fields,and other cadmium reduction cultivation measures should be combined to achieve safe planting.Anliangyou 2 has a more stable yield performance in high cadmium polluted areas,and two low cadmium absorbing late rice varieties can be planted in high cadmium polluted areas with cultivation measures to improve seed setting rate,thereby achieving high yield.It can be promoted in ar-eas with moderate and below cadmium pollution.
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