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| Effects of combined chemical and biochar-based fertilizers applied on Cu absorption and transport in rice under Astragalus sinicus conditions |
| Received:May 18, 2019 |
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| KeyWord:rice;Astragalus sinicus;transport;Cu;biochar-based fertilizer |
| Author Name | Affiliation | E-mail | | YU Cheng-long | School of Land Resources and Environment, Jiangxi Agricultural University/Innovative Integration Center of Industry and Education in Resource Utilization of Agricultural Waste, Prevention and Control of Non-point Pollution of Jiangxi Province, Nanchang 330045, China | | | TANG Jian | School of Land Resources and Environment, Jiangxi Agricultural University/Innovative Integration Center of Industry and Education in Resource Utilization of Agricultural Waste, Prevention and Control of Non-point Pollution of Jiangxi Province, Nanchang 330045, China | | | YU Wei | Burea of Agriculture and Rural Affairs of the Wanzai County, Wanzai 336100, China | | | NI Guo-rong | School of Land Resources and Environment, Jiangxi Agricultural University/Innovative Integration Center of Industry and Education in Resource Utilization of Agricultural Waste, Prevention and Control of Non-point Pollution of Jiangxi Province, Nanchang 330045, China | | | XIE Zhi-jian | School of Land Resources and Environment, Jiangxi Agricultural University/Innovative Integration Center of Industry and Education in Resource Utilization of Agricultural Waste, Prevention and Control of Non-point Pollution of Jiangxi Province, Nanchang 330045, China | | | KANG Li-chun | School of Engineering, Jiangxi Agricultural University, Nanchang 330045, China | | | RONG Qin-lei | School of Land Resources and Environment, Jiangxi Agricultural University/Innovative Integration Center of Industry and Education in Resource Utilization of Agricultural Waste, Prevention and Control of Non-point Pollution of Jiangxi Province, Nanchang 330045, China | | | ZHOU Chun-huo | School of Land Resources and Environment, Jiangxi Agricultural University/Innovative Integration Center of Industry and Education in Resource Utilization of Agricultural Waste, Prevention and Control of Non-point Pollution of Jiangxi Province, Nanchang 330045, China
Key Laboratory of Nutrient Management of Farmland and Prevention of Agricultural NPS Pollution, Nanchang 330045, China | zchh3366@163.com |
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| Abstract: |
| To address Cu pollution in paddy field soils, we studied the effects of a chemical fertilizer combined with a biochar-based fertilizer on Cu absorption and transport in the soil-rice system under ploughed Astragalus sinicus conditions. Pot experiments were conducted with five treatment groups, including control (CK, unfertilized), conventional nitrogen fertilizer (CN), A. sinicus + nitrogen fertilizer (CNG)A. sinicus + organic fertilizer + nitrogen fertilizer (CNGO), and A. sinicus + biochar-based fertilizer + nitrogen fertilizer (CNGC). The effects of different fertilization treatments on the growth of early-season rice, Wuyou 156, were evaluated in uncontaminated and contaminated soil, and the Cu absorption and transportation processes were examined in rice organs. The results showed that, compared with the CN treatment, the grain yield increased by 47.1% and 50.1% in uncontaminated and contaminated soil, respectively, with the CNG treatment. Compared with the CNG treatment, the CNGC treatment only increased the grain yield by 4.5% and 12.8% in uncontaminated and contaminated soil, respectively. Under the application of inorganic fertilizer, Cu concentrations were the highest in rice roots and the total absorbed Cu was also at its maximum. In contaminated soil, there was a risk of heavy metal (Cu)pollution in brown rice for the CNG treatment; however, the Cu content of brown rice for the CNGC treatment was lower than the related food hygiene standard (10.0 mg·kg-1). Further results indicated that the Cu transporting capacity from root to straw was clearly enhanced under the conditions of ploughed A. sinicus, while the Cu transporting capacity from straw to husk was inhibited in Cu-contaminated soil. Moreover, in contaminated soil, the mass fraction of available Cu was at its maximum for the CN treatment. Compared with the CN treatment, the mass fraction of available Cu in soil for the CNGC treatment was reduced by 39.4%. Compared with the CK treatment, the mass fraction of available Cu in soil for the CNGC treatment was reduced by 17.6%. In summary, in the case of ploughed A. sinicus, a fertilization method that uses a biochar-based fertilizer combined with a chemical fertilizer not only increased rice yield but also inhibited rice Cu absorption and transportation processes, thus reducing the Cu content of rice grains. Thus, such a fertilization method could be applied for the improvement and remediation of Cu in contaminated rice soil. |
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