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Uptake, translocation, and accumulation of Cd and its interaction with mineral nutrients (Fe, Zn, Ni, Ca, Mg) in upland rice.
Chemosphere 2019 January
An analysis of the Cd and mineral nutrients accumulation of upland rice was performed in an experimental field with hard-ridged plots containing three soils with exogenous Cd addition at rates of 0, 0.25, 0.5, 1, 2, 4, 8, 16 mg kg-1 five years prior to commence this experiment. Aims of this investigation were to study uptake, translocation, and accumulation of Cd by an upland rice (Huyou2) and effects of Cd addition on the accumulation of Fe, Zn, Ni, Ca, and Mg. The results demonstrate the mean Cd content in the plant parts, from highest to lowest, were as follows: root, stem, leaf, and brown rice. The Cd content in the brown rice of the upland rice was below the limit of Cd in rice (0.2 mg kg-1 ) from China (GB 2762-2017) when the amount of Cd added was ≤ 1 mg kg-1 . This observation can be attributed to lower TFsoil-grain of Cd in upland rice. Significant differences were observed between Cd concentrations present in brown rice from the three soils which can be mainly attributed to the differences in DTPA-extractable soil Cd because of different soil pH. Addition of high concentrations of Cd to soil was found to reduce Fe, Zn, Mg, and increased Ni uptake by the roots and their accumulation in brown rice. Altogether, results of this study suggest that it may be possible to cultivate upland rice in slightly Cd-polluted soils and Cd toxicity and accumulation in upland rice can be minimized by optimizing the macro and micronutrient composition of the soil.
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