Risk assessment through rice (Oryza sativa) in sludge treated soil

Anil Kumar Verma; R D Singh; S P Datta; S Kumar; Rahul Mishra; Vivek K Trivedi; V K Sharma; M C Meena

doi:10.56093/ijas.v90i7.105601

Authors

Anil Kumar Verma ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
R D Singh ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
S P Datta ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
S Kumar ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
Rahul Mishra ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
Vivek K Trivedi ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
V K Sharma ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
M C Meena ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India

https://doi.org/10.56093/ijas.v90i7.105601

Keywords:

DTPA extractable metals, Grain metal content, Hazard quotient, Risk assessment, Sludge *Corresponding

Abstract

An experiment was carried out on basmati rice (Oryza sativa, var. Pusa Basmati 1121) using IARI soil to assess the effect of applied sludge on different soil properties, metals content in rice grain and computed hazard quotient for suitability of rice grain for human consumption. The different doses of sludge were used as treatments 0, 10, 20, 30, 40 and 50 g/kg.The results indicated that applied sludge @ (50 g/kg) reduced the pH from 7.98 (control) to 7.21 of sludge amended soil. Whereas, the EC increased from 0.22 (control) to 1.33 dS/m under applied @ 50 g sludge/kg of soil. The organic carbon content and cation exchange capacity were found highest in 50 g sludge/ kg soil treatment as compared to control. DTPA Extractable metals in post- harvest soil were significantly higher in sludge application @ ≥ 30 g/kg treatments. The value of HQ ranged from 0.05 to 0.49 and 0.02 to 0.09 for Pb and Cd, respectively across the various treatments of sludge addition. It can be concluded that risk assessment for intake of metals through consumption of rice by human indicated that application of sludge should be restricted up to 20 g/ kg unfit for rice cultivation.

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