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| Yield and Cadmium Accumulation of Rice Following Application of Phosphate Fertilizer Containing Cadmium |
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| KeyWord:phosphorus fertilizer; cadmium; accumulation; rice |
| Author Name | Affiliation | | OU Hui-ping | Agricultural Resources and Environmental Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | ZHOU Liu-qiang | Agricultural Resources and Environmental Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | LIU Xi-hui | Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | HUANG Jin-sheng | Agricultural Resources and Environmental Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | ZENG Yan | Agricultural Resources and Environmental Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | HUANG Mei-fu | Agricultural Resources and Environmental Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | XIE Ru-lin | Agricultural Resources and Environmental Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | TAN Hong-wei | Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | SU Xue-jun | Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China |
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| Abstract: |
| Phosphate fertilizers are essential for agriculture production, but there is an increasing concern over the risk of cadmium（Cd） contamination via fertilization. This study evaluated the yield and Cd accumulation of rice plant following different rates of phosphate fertilizer in a two year field experiment. Rice yield was increased by applying phosphate fertilizer, but not by the application rates. However, Cd concentrations in the grains increased firstly and then decreased with phosphate rates, but were still lower than the level of National Food Health Standards. The concentrations and accumulation of Cd in the grains were highest at 63 kg P2O5·hm-2 of phosphate application rate, which was significantly higher than the control. At 252 kg·hm-2 of phosphate fertilizer, however, Cd concentration in the grains was closed to that of control, and Cd concentrations in the stems and leaves decreased significantly as well. Absorption of Cd in shoots declined with the rates of phosphate fertilizer and the fertilizer rate at which Cd absorption in shoots was 100% was 116.6 kg·hm-2 for early rice cultivar and 174.6 kg·hm-2 for late rice cultivar. These results indicate that applying phosphate fertilizer at early rice：81 kg·hm-2 and late rice：63 kg·hm-2 would not only maintain rice yield, but also make grain and soil ecological safety. |
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