Abstract
Purpose
Phosphate (P) fertilizers are being widely used to increase crop yield, especially in P-deficient soils. However, repeated applications of P could influence trace element bioaccumulation in crops. The effects of 5-year P enrichment on trace element (Cu, Zn, Cd, Pb, As, and Hg) accumulation in Oryza sativa L. were thus examined.
Materials and methods
Two paddy soils with different initial P availabilities were amended with and without P fertilizer from 2009 to 2013. Trace elements and P levels in rice and soils were analyzed.
Results and discussion
In soil initially with limited P, P amendment enhanced grain Pb, As, and Hg concentrations by 1.8, 1.5, and 1.4-fold, respectively, but tended to decrease the grain Cd level by 0.73-fold, as compared to the control. However, in soil initially with sufficient P, P amendment tended to reduce accumulation of all examined elements in rice grain.
Conclusions
Phosphate amendment in initially P-limited and P-sufficient soils had different effects on trace element availability in soil (as reflected by extractable element) and plant physiology (growth and metal translocation), resulting in contrasting patterns of trace element accumulation in rice between the two types of soils. Our study emphasized the necessity to consider the promoting effects of P on Pb, As, and Hg accumulation in grain in initial P-deprived soil.
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Acknowledgments
Financial support was provided by the National Natural Science Foundation of China (41301559 and 41125007), the Natural Science Foundation of Jiangsu Province (BK20131041) and the Chinese National Basic Research Program (2015CB150403). We thank the anonymous reviewers for their comments.
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Dang, F., Wang, WX., Zhong, H. et al. Effects of phosphate on trace element accumulation in rice (Oryza sativa L.): a 5-year phosphate application study. J Soils Sediments 16, 1440–1447 (2016). https://doi.org/10.1007/s11368-015-1342-9
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DOI: https://doi.org/10.1007/s11368-015-1342-9