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| Effects of safe utilization of cadmium-contaminated paddy field under soil conditioners combined with foliar barrier agents |
| Received:March 24, 2024 |
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| KeyWord:rice;joint regulation;Cd contaminates farmland;safe utilization;cost-benefit analysis |
| Author Name | Affiliation | E-mail | | TANG Lebin | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | HUANG Fengyan | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | WU Chenrun | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | DONG Xinyue | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | ZHOU Zihan | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | SONG Bo | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | songbo@glut.edu.cn |
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| Abstract: |
| To clarify the effects of soil conditioners combined with foliar barrier agents on the absorption and accumulation of Cd in rice, the technical mode of soil application combined with leaf spray to control Cd uptake in rice was discussed. In the plot experiment, quicklime（Li）, silicon fertilizer（Si）, calcium magnesium phosphate fertilizer（CaMg-P）and calcium-silicone alkaline conditioner（Ca-Si） were used as soil conditioners, and fluid silicon（Si-l）and chelated selenium（Se）were used as foliar barrier agents to explore the differences in Cd accumulation in rice plants under different technology integration modes. The results showed that compared with the control treatment, the soil pH value increased by 0.50-0.86 units under different treatments, and the soil DTPA-Cd content decreased significantly（P<0.05）, with a decrease of 30.1%-41.2%. Except for T6（Li+Se）and T8（CaMg-P+Se）, the yield of other treatments was increased by 0.44%-7.85% compared with CK treatment. Compared with CK, the Cd content of roots, stems, leaves, rachises and brown rice was significantly reduced under different combined control measures（P<0.05）, and the Cd content of brown rice was lower than the national safety standard（0.2 mg·kg-1）, and the best Cd reduction effect of T6（Li+Se）treatment was 0.501 mg·kg-1 decreased to 0.123 mg· kg-1. Based on TFhaulm-brown rice and TFroots -brown rice economic benefits, soil application of quicklime combined with leaf spraying selenium chelation was a feasible technical model for the safe utilization of cadmium-contaminated paddy field, which can realize the safe production of rice and increase the income of farmers in moderate Cd polluted fields. |
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