TY - JOUR
T1 - Cadmium bioavailability in acidic soils under bean cultivation
T2 - role of soil additives
AU - Mondal, S. C.
AU - Sarma, B.
AU - Farooq, M.
AU - Nath, D. J.
AU - Gogoi, N.
N1 - Funding Information:
We are thankful to Regional Agricultural Research Station (RARS), Nagaon, for providing the seeds for the research along with Tezpur University, Napaam, and Assam Agricultural University, Jorhat, for providing us the facility to conduct the study. We are also indebted to Sophisticated Analytical Instrumentation Centre (SAIC), Tezpur University, Assam, for providing the instrumentation facility required for this study.
Publisher Copyright:
© 2019, Islamic Azad University (IAU).
PY - 2020/1/1
Y1 - 2020/1/1
N2 - Continuous application of phosphate fertilizer and bio-solids leads to cadmium (Cd) accumulation in agricultural soil. Acidic soil environment makes the situation worsen due to the conversion of higher soil Cd to plant available form. Therefore, identifying effective and economical methods to reduce the bioavailability of soil Cd is imperative. This pot experiment was conducted in an acidic soil (pH 5.69) with three different soil additives [biochar, plant growth-promoting rhizobacteria (PGPR) and ZnSO4] under three levels (6, 12 and 18 mg kg−1) of Cd on common bean (Phaseolus vulgaris L. cv. Falguni). Biochar and ZnSO4 were mixed with soil at 5.5 and 0.1 Mg ha−1, respectively, before seed sowing, while PGPR was applied as a seed coating. A significant reduction in plant morpho-physiological and biochemical parameters and soil chemical and biological properties was recorded with increasing Cd levels. Biochar, PGPR and ZnSO4 addition resulted in substantial improvement in the studied plant and soil parameters in Cd-treated soil by significantly reducing the bioavailability of soil Cd. ZnSO4 addition recorded improved (51%) plant growth in terms of total biomass with lower (57% shoot and 42% reduction in root) plant accumulation of Cd. The highest reduction in bioavailability of soil Cd was recorded with the application of biochar (34–97% reduction) compared with ZnSO4 (14–89%). Though application of PGPR reduced the Cd bioavailability to 94% at the lowest contamination, it increased Cd bioavailability by 2% at the highest level of contamination. Thus, biochar application (5.5 Mg ha−1) as soil additive is an effective means to mitigate Cd toxicity in acidic soils.
AB - Continuous application of phosphate fertilizer and bio-solids leads to cadmium (Cd) accumulation in agricultural soil. Acidic soil environment makes the situation worsen due to the conversion of higher soil Cd to plant available form. Therefore, identifying effective and economical methods to reduce the bioavailability of soil Cd is imperative. This pot experiment was conducted in an acidic soil (pH 5.69) with three different soil additives [biochar, plant growth-promoting rhizobacteria (PGPR) and ZnSO4] under three levels (6, 12 and 18 mg kg−1) of Cd on common bean (Phaseolus vulgaris L. cv. Falguni). Biochar and ZnSO4 were mixed with soil at 5.5 and 0.1 Mg ha−1, respectively, before seed sowing, while PGPR was applied as a seed coating. A significant reduction in plant morpho-physiological and biochemical parameters and soil chemical and biological properties was recorded with increasing Cd levels. Biochar, PGPR and ZnSO4 addition resulted in substantial improvement in the studied plant and soil parameters in Cd-treated soil by significantly reducing the bioavailability of soil Cd. ZnSO4 addition recorded improved (51%) plant growth in terms of total biomass with lower (57% shoot and 42% reduction in root) plant accumulation of Cd. The highest reduction in bioavailability of soil Cd was recorded with the application of biochar (34–97% reduction) compared with ZnSO4 (14–89%). Though application of PGPR reduced the Cd bioavailability to 94% at the lowest contamination, it increased Cd bioavailability by 2% at the highest level of contamination. Thus, biochar application (5.5 Mg ha−1) as soil additive is an effective means to mitigate Cd toxicity in acidic soils.
KW - Bioavailability
KW - Cadmium
KW - Common bean
KW - Soil additives
KW - Soil stabilization
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U2 - 10.1007/s13762-019-02263-0
DO - 10.1007/s13762-019-02263-0
M3 - Article
AN - SCOPUS:85061440638
SN - 1735-1472
VL - 17
SP - 153
EP - 160
JO - International Journal of Environmental Science and Technology
JF - International Journal of Environmental Science and Technology
IS - 1
ER -
