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| DOI：10.13522/j.ggps.2020070 |
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| The Effects of Coupling Clay and Phosphorus Fertilization on Passivation and Uptake of Cadmium by Wheat Seedling in Fluvo-aquic Soil |
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SUN Xianghui, CAI Hanyu, ZHAO Jing, TIAN Yingying, DU Zhenjie, NIU Decao
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1. Henan Institute of Technology, Xinxiang 453002, China;2. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;3. Laboratory of Organic Solid Waste Treatment and Resource Utilization, Henan Institute of Technology, Xinxiang 453003, China
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| Abstract: |
| 【Background】Cadmium (Cd) pollution accounts for 7.0% of soil contamination by heavy metals in China. Since Cd is a nonessential element for plants and but bioavailable for crops to take up, understanding the factors that modulate Cd mobility and its remediation is critical to safeguarding agricultural production and improving sustainable utilization of soil resource.【Objective】The purpose of this paper is to investigate the efficacy of combining clay and phosphorus fertilization as a technique to passivate Cd in a Fluvo-aquic soil and thereby to reduce its uptake by wheat seedlings.【Method】Pot experiments were conducted to evaluate the effects of applying sepiolite, attapulgite, bentonite in combination with potassium dihydrogen phosphate on soil pH, Cd bioavailability, growth and Cd uptake by the wheat.【Result】All treatments increased soil pH and significantly reduced bioavailable Cd in soil by 5.84%~17.53%. They also boosted growth of the wheat seedlings and reduced Cd content in shoots by 40.66%~63.35% and Cd content in the roots by 18.49%~38.83%, compared to the control. The passivation effect of the clays on Cd was ranked in sepiolite>attapulgite>bentonite, which could be further enhanced by adding phosphorus fertilizer.【Conclusion】Combing sepiolite (1%) and phosphorus fertilizer (0.04%) was most effective for in situ remediation of Cd-polluted Fluvo-aquic soil, with little effect on soil pH. |
| Key words: clays; phosphorus fertilizer; fluvo-aquic soil; cadmium contamination; winter wheat |
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