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| Intensification of the intercropping effect of phytoremediation of soil contaminated with cadmium and zinc using potassium fertilizer |
| Received:June 10, 2021 |
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| KeyWord:intercropping;potassium fertilizer;application level;Cd and Zn contamination;wheat seedling;Sedum plumbizincicola |
| Author Name | Affiliation | E-mail | | ZOU Jiacheng | National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | NIU Yingxin | National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | SONG Fupeng | National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | fpsong@126.com | | XING Xiaofei | Shandong Provincial Agricultural Technology Extension Center, Jinan 250100, China | | | CHEN Guowei | Dezhou Natural Resources Bureau & Forestry Bureau, Dezhou 253000, China | | | ZHUGE Yuping | National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | LOU Yanhong | National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | |
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| Abstract: |
| Intercropping wheat(Triticum aestivum L.) and Sedum plumbizincicola is an effective method for in situ green production and remediation for phytoremediation of soil contaminated with heavy metals. The application of potassium fertilizer is one of the agronomic practices that increases wheat yield. In this study, a pot experiment was carried out to investigate the effects of potassium fertilizers on the amendment of cadmium(Cd) and zinc(Zn) contaminated soils using wheat and Sedum plumbizincicola intercrops. The effects of different application levels(50, 100 mg·kg-1, and 200 mg·kg-1, calculated in K2O) of potassium chloride or potassium sulfate on soil pH, the concentration of Cd and Zn in the soil, and the biomass and Cd and Zn concentrations in wheat and Sedum plumbizincicola was evaluated. Corresponding treatments without the application of potassium fertilizers were used as the control. The results showed that increasing the application of potassium chloride or potassium sulfate decreased soil pH by 0.322 and 0.411 units, respectively. In addition, it increased soil available Cd and Zn concentration, plant biomass, and Cd and Zn concentration in wheat and Sedum plumbizincicola seedlings when compared with the control. Furthermore, the application of potassium fertilizer increased the removal rate of soil Cd and Zn from 15.1% to 23.8% and from 1.75% to 4.70%, respectively. This study shows that potassium fertilizer enhances soil amendment when wheat and Sedum plumbizincicola intercrops are grown in Cd and Zn contaminated soils. It can be concluded that the application of potassium chloride at 200 mg·kg-1 achieves the best results. |
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