Residual impact of biochar on cadmium uptake by rice (<Emphasis Type="Italic">Oryza sativa</Emphasis> L.) grown in Cd-contaminated soil |
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Authors: | Muhammad Rizwan Shafaqat Ali Tahir Abbas Muhammad Zia ur Rehman Mohammad I Al-Wabel |
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Institution: | 1.Department of Environmental Sciences and Engineering,Government College University,Faisalabad,Pakistan;2.Institute of Soil and Environmental Sciences,University of Agriculture Faisalabad,Faisalabad,Pakistan;3.Soil Sciences Department, College of Food and Agricultural Sciences,King Saud University,Riyadh,Saudi Arabia |
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Abstract: | Cadmium (Cd) is the family member of toxic heavy metals, and its accumulation in food crops has become a global environmental constraint. Biochar potentially minimizes the metal contents in plants, but limited work has been reported on its residual effect on subsequent crops. The residual effect of various biochar levels (0, 1.5, 3.0, and 5.0% w/w) on Cd accumulation in rice has been investigated in this study. Biochar treatments enhanced the rice growth, photosynthesis, and antioxidant enzymes, whereas diminished the Cd contents and oxidative stress in rice. Cadmium concentration in shoots decreased by 24.4, 36.6, and 57.5% in 1.5, 3.0, and 5.0% biochar treatments over the control. Biochar supply enhanced the soil pH and electrical conductivity, whereas diminished the soil bioavailable Cd. Overall, the results depicted a significant residual impact of rice straw biochar on rice growth attributes and Cd uptake. However, studies are still needed to explore the long-term sustainability of biochars prepared from different feedstocks on bioavailability of toxic metals in soils and uptake by food crops under field conditions. |
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