Abstract
Cadmium (Cd) pollution in vegetable crops has become a serious problem in recent years. Owing to the limited availability of arable land resources, large areas of Cd-contaminated lands are inevitably being used for the production of vegetables, posing great risks to human health via the food chain. However, strategies to improve yield and reduce Cd concentration in crops grown in contaminated soils are being developed. In the present study, using pot experiments, we investigated the effects of two slow-release nitrogen fertilizers (SRNFs), resin-coated ammonium nitrate (Osmocote313s), and resin-coated urea (urea620), on the growth and Cd concentration of the Cd-contaminated pakchoi. The results showed that pakchoi grown in soil containing 5 mg kg−1 of Cd-induced oxidative stress (indicated by malondialdehyde (MDA), H2O2, and O2 ·−) and photosynthesis inhibition, which in turn was restored with the application of SRNFs. However, pakchoi grown in Cd-contaminated soil supplied with Osmocote313s and urea620 showed 103 and 203 % increase in fresh weight and 51–55 % and 44–56 % decrease in Cd concentration, respectively, as compared with their controls (pakchoi treated with instant soluble nitrogen fertilizers). On the basis of an increase in their tolerance index (47–238 %) and a decrease in their translocation factor (7.5–21.6 %), we inferred that the plants treated with SRNFs have a stronger tolerance to Cd and a lower efficiency of Cd translocation to edible parts than those treated with instant soluble nitrogen fertilizers. Therefore, in terms of both crop production and food safety, application of SRNFs could be an effective strategy for improving both biomass production and quality in pakchoi grown under Cd stress.
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This work was financially supported by the Zhejiang Province Natural Science Foundation (LY14C130001 and LR13C130001), the National Key Research and Development Program (2016YFD0200103), the Natural Science Foundation of China (31622051) and Scientific Research Project of Education Department of Zhejiang Province (Y201017078).
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Responsible editor: Elena Maestri
Ran-Ran Zhang and Yue Liu contributed equally to this work.
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Zhang, RR., Liu, Y., Xue, WL. et al. Slow-release nitrogen fertilizers can improve yield and reduce Cd concentration in pakchoi (Brassica chinensis L.) grown in Cd-contaminated soil. Environ Sci Pollut Res 23, 25074–25083 (2016). https://doi.org/10.1007/s11356-016-7742-6
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DOI: https://doi.org/10.1007/s11356-016-7742-6