| Affiliation: | 1.Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science,Chinese Academy of Sciences,Nanjing,China;2.Division of Life Science,The Hong Kong University of Science and Technology (HKUST),Kowloon,Hong Kong;3.State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment,Nanjing University,Nanjing,China |
| Abstract: | PurposePhosphate (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 methodsTwo 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 discussionIn 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.ConclusionsPhosphate 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. |
