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| Interaction effects of Miscanthus lutarioriparius-derived biochar and cadmium passivators on rice cadmium content and yield |
| Received:April 11, 2018 |
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| KeyWord:Miscanthus lutarioriparius biochar;soil conditioner;cadmium passivator;cadmium reduction potential |
| Author Name | Affiliation | E-mail | | LIAO Xiong-hui | College of Bioscience & Biotechnology, Hunan Agricultural University, Changsha 410128, China | | | LONG Qin | College of Bioscience & Biotechnology, Hunan Agricultural University, Changsha 410128, China | | | WANG Hui-qun | College of Bioscience & Biotechnology, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering Laboratory of Miscanthus Ecological Applications, Changsha 410128, China | | | YI Zi-li | College of Bioscience & Biotechnology, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering Laboratory of Miscanthus Ecological Applications, Changsha 410128, China | | | XUE Shuai | College of Bioscience & Biotechnology, Hunan Agricultural University, Changsha 410128, China
Hunan Engineering Laboratory of Miscanthus Ecological Applications, Changsha 410128, China | xue_shuai@hunau.edu.cn |
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| Abstract: |
| This study was designed to explore the interaction effects of Miscanthus lutarioriparius-derived biochar with five cadmium (Cd) passivators on rice Cd content and yield. Based on the results, it was expected to determine their optimum application rates and develop a M. lutarioriparius biochar-based soil conditioner. The L25 (56) orthogonal test was firstly used to determine the experimental treatments and then 25 treatments with three replications were conducted in a pot trial. Results showed that the interaction of the six tested factors could both reduce the Cd content of rice plants and grains, and improve the rice yield significantly (P<0.05). The optimum interaction ratio of M. lutarioriparius-derived biochar:humid acid:potassium silicate:calcium magnesium phosphate:zinc sulfate:slaked lime was 200:60:3:30:4:120; therefore, the recommended application rate of the M. lutarioriparius soil conditioner was 6.25 t·hm-2. Three experimental treatments, whose compositions were close to the above optimum interaction ratio, were used to determine the application effect of M. lutarioriparius soil conditioner on rice yield. Results showed that application of the three tested treatments could decrease the Cd content of rice plants to 0.88~1.65 mg·kg-1 with a Cd reduction potential of 54.4%~75.7%, and of rice grains with husk to 0.13~0.17 mg·kg-1 with a Cd reduction potential of 45.2%~58.1%. Additionally, applications of all three treatments could increase the rice grain yields with the highest potential of 1.89 t·hm-2( i.e., increasing rate of 34.8%). These results proved that the M. lutarioriparius biochar-based soil conditioner could decrease the rice Cd content and enhance the rice yield simultaneously, indicating a huge market potential. |
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