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| Effects of smooth vetch combined with different immobilization amendments on baby cabbage growth and Cd accumulation |
| Received:January 05, 2023 |
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| KeyWord:smooth vetch;immobilization amendment;cadmium;contaminated soil;baby cabbage;growth;transshipment |
| Author Name | Affiliation | E-mail | | RUAN Yannan | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China
Kunming College, Kunming 650214, China | | | Lü Benchun | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China
College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | YANG Wei | Kunming Agricultural Product Quality and Safety Center, Kunming 650118, China | | | WANG Yingxue | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | CHEN Jianfeng | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | YIN Mei | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | CHEN Hua | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | WANG Wei | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | LIANG Zhimei | Kunming Research Institute of Agricultural Sciences, Kunming 650118, China | | | WANG Zhiyuan | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | wzyaas@hotmail.com | | FU Libo | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | 1198276883@qq.com |
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| Abstract: |
| The concentrations of heavy metals in soil and the heavy metal content in staple crops can be effectively reduced by rational utilization of leguminous green manure smooth vetch. In this study, a pot experiment was conducted to study the effects of leguminous green manure smooth vetch with different immobilization amendments（biochar, silicon fertilizer, and calcium magnesium phosphate fertilizer） on the yield, root morphology, photosynthesis, and cadmium transport of baby cabbage. Single application of smooth vetch increased the yield and root-shoot ratio of baby cabbage, significantly increased the root surface area, root volume, stomatal conductance, transpiration rate, and chlorophyll content, significantly reduced the soil available Cd content（23.20 %, P<0.05）, and significantly reduced the Cd content in the aboveground and underground parts of baby cabbage by 22.34% and 15.83%, respectively. Smooth vetch application with different immobilization amendments, particularly biochar, significantly increased the aboveground biomass and had good yield-increasing effect, while the silicon fertilizer mainly increased the underground biomass. Smooth vetch application with immobilization amendments reduced root surface area, root tip number, transpiration rate, intercellular CO2 content and chlorophyll content. Compared with the single application of smooth vetch, the application of smooth vetch combined with silicon fertilizer increased the available Cd content in soil （18.34%, P<0.05 ) and the Cd content in the underground part of baby cabbage（26.71%, P<0.05）, but had no significant effect on the Cd content in the aboveground part ; application of calcium magnesium phosphate fertilizer combined with vetch had no significant effect on soil available Cd and Cd content in underground part of baby cabbage, but increased Cd content in aboveground part（31.22%, P<0.05）. Across all treatments, the combination of smooth vetch and biochar had the best effect on the passivation of soil Cd and the reduction of Cd content in the aboveground and underground parts of baby cabbage compared with the control, which were 43.93%, 14.57% and 25.37%, respectively. Therefore, it is recommended that leguminous green manure smooth vetch and biochar should be reasonably applied to reduce Cd activity and alleviate Cd toxicity to baby cabbage in Cd-contaminated areas. |
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