John Wiley & Sons, Ltd.

Intercropping different varieties of radish can increase cadmium accumulation in radish

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Genetic diversity has supplied effective ways to improve crop yields and disease resistance. Therefore, we may be able to reduce crop uptake of heavy metals by collecting germplasm resources. In this study, cadmium accumulation and nutrients in radish was investigated by intercropping three genotypes (red, green, and white radish) in different combinations. Both pot and field experiments showed that cadmium content in radish was increased by intercropping two or three genotypes, except when white radish was intercropped with green radish. The biomass of red radish was improved by a mixture of all three genotypes, and green radish biomass was improved by intercropping with other two varieties, while white radish biomass was improved by intercropping with red radish in both pot and field experiments. The pot experiment indicated that the soil exchangeable cadmium concentration of red radish grown with green radish was lower than that of monoculture, while red radish intercropped with white radish was between the respective monocultures; the soil exchangeable cadmium concentrations of green radish grown with white radish and with all three genotypes grown together were greater than those of the monocultures. Some intercropping modes also improved potassium and phosphorus contents in the edible parts of radish in pot experiment. Environ Toxicol Chem © 2014 SETAC

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