Effects of soil amendments, foliar sprayings of silicon and selenium and their combinations on the reduction of cadmium accumulation in rice

作     者：Demin LI Hongyan LIU Min GAO Jing ZHOU Jun ZHOU Demin LI;Hongyan LIU;Min GAO;Jing ZHOU;Jun ZHOU

作者机构：College of AgricultureGuizhou UniversityGuiyang 550025China Key Laboratory of Soil Environment and Pollution RemediationInstitute of Soil ScienceChinese Academy SciencesNanjing 210008China University of Chinese Academy of SciencesBeijing 100049China National Engineering and Technology Research Center for Red Soil ImprovementRed Soil Ecological Experiment StationChinese Academy of SciencesLiujiazhan PlantationYingtan 335211China 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2022年第32卷第4期

页      面：649-659页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 0901[农学-作物学] 

基　　金：supported by the Key Scientific Research and Development Projects of Jiangxi Provence,China(No.20194ABC28010) the National Key Technology R&D Program,China(No.2015BAD05B01) 

主　　题：antioxidant enzyme activity bioconcentration factor cadmium bioavailability rice yield soil contamination synergistic effect translocation factor 

摘      要：Agricultural soil contamination by cadmium (Cd) is becoming one of the most serious environmental issues and public concerns. In this study, factorial arrangements of treatments were designed to explore the effects of two soil amendments, sodium sulfide-biofuel ash (SSBA) and lime (0.1%), and three foliar applications, silicon (Si, 2.5 mmol L-1), selenium (Se, 40 mg L-1), and their combination (SS), on Cd reduction in rice (Oryza sativa L.) in a pot experiment, which were then verified in a field experiment. Compared with the control without amendment but with spraying of deionized water, both SSBA and lime significantly reduced concentrations of CaCl2-extractable Cd in soil by 30%–39% and 31%–40% and Cd in brown rice by 44%–63% and 53%–72% in the pot and field experiments, respectively. Foliar Si, Se, and SS applications significantly reduced Cd accumulation in brown rice by 62%–64%, 72%–83%, and 39%–73%, respectively, increased rice grain yield, and improved antioxidant enzyme activities in rice leaves but with different trends in the pot and field experiments. Combinations of SSBA and lime with Si, Se, and SS had a non-significant synergistic effect on Cd reduction in brown rice compared to only foliar spraying or soil amendment in both pot and field experiments, although SSBA + Se and SSBA + Si reduced Cd concentration in brown rice by 16%–34% and 14%–24% compared to only foliar Si and Se and soil SSBA applications, respectively. Soil lime application and foliar Si spraying were the most cost-effective strategies to reduce Cd accumulation in brown rice in the field and pot experiments, respectively. Although soil amendments and foliar treatments were individually effective, their combinations failed to generate a significant synergistic reduction of Cd concentration in brown rice.