Analytical Sciences

Abstract − Analytical Sciences, 36(5), 531 (2020).

Variations in Cadmium Concentrations in Rice and Oxidation-Reduction Potential at the Soil Surface with Supplementation of Fermented Botanical Waste-based Amendment in Large-scale Farmland
Nobuhiko WADA,*1,*2 Gao DI,*1 Hideyuki ITABASHI,*1 Masanobu MORI,*3 Yusuo LIN,*4 Shaopo DENG,*4 Weiwei XU,*5 Weiwei GUO,*6 Yuanheng LUO,*6 and Dianyu ZHU*7
*1 Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin-cho, Kiryu 376-8515, Japan
*2 Shanghai Shenglong Environment Remediation Materials, Co. Ltd, Building 6, No. 936, Guoshun Road, Nanqiao Town, Fengxian District, Shanghai 201400, China
*3 Faculty of Science and Technology, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520, Japan
*4 Nanjing Institute of Environmental Science, MEP, P. R. China, Jiangwangmiao Road 8, Xuanwu District, Nanjing, Jiangsu Province 210042, China
*5 Geological Survey of Jiangsu Province, 700 Zhujiang Road, Xuanwu District, Nanjing, Jiangsu Province 210018, China
*6 Shanghai Shenglong Environment Remediation Technologies, Co. Ltd, Floor 13, Building No. 2, 100 Qinzhou Road, Xuhui District, Shanghai 200235, China
*7 School of the Environment, Nanjing University, 163 Xianlin Road, Qixia District, Nanjing, Jiangsu Province 210023, China
We monitored the relationship between the cadmium (Cd) concentration uptake of rice and the oxidation-reduction potential (ORP) at the soil surface with the supplementation of fermented botanical waste-based amendment (FBWA), an organic fertilizer prepared from woody and food wastes. This study was carried out for 3 years in the western part of Jiangsu Province, China. It was found that the Cd concentration taken up by rice was correlated to a decreased the ORP of the cultivated soil. The yield of rice was ∼1.20 times higher than that of the control plot. The effects of reducing the Cd content in rice and increasing the rice yield remained for 2 years after FBWA application. Finally, Cd was immobilized in the soil with adsorption to FBWA or the decomposed products. The ORP measurement during rice cultivation might be a key index to predict the suppression effect of Cd uptake into the rice or limitation of the sustainable effect by the FBWA.