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Subject: Soil Science × Start date: 2020 × Type: Thesis ×
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    Effect of rice residue biochar on the bioavailability of lead and cadmium to Indian mustard (Brassica juncea (L.) Czern.)
    (Punjab Agricultural University, Ludhiana, 2020) Dubey, Shikha; Sikka, R.
    The investigation titled “Effect of rice residue biochar on the bioavailability of lead and cadmium to Indian mustard (Brassica juncea (L.) Czern.)” was conducted at screen house, Department of Soil Science, Punjab Agricultural University, Ludhiana during rabi season of 2018-2019. The objectives of study were to determine the effects of addition of rice residue biochar on immobilization of Cd and Pb in soil and their translocation to Indian mustard (Brassica juncea (L.) Czern.). Two differently irrigated - tube well water irrigated (TWI) and sewage water irrigated (SWI) - soils were collected and amended with four levels of rice residue biochar and further spiked with four levels of Cd and Pb individually. Spiking of Cd and Pb significantly decreased the shoot dry matter yield (DMY) in both TWI and SWI soil. The DMY in TWI soil increased by 12.5 and 19.6 per cent compared to control in Cd and Pb contaminated soil, respectively at 2 per cent addition of biochar whereas in case of SWI soil the corresponding increase was 19.2 and 17.5 per cent, respectively. Addition of rice residue biochar significantly increased the immobilization of DTPA-extractable Cd and Pb in both TWI and SWI soil. The DTPA-Cd and Pb decreased by 44.9 and 47.1 per cent in TWI soil at 4 per cent addition of biochar whereas in SWI soil the decrease was 38.1 and 39.5 per cent, respectively. Biochar addition countered the Cd and Pb content and increased the macro and micronutrient content of Indian mustard. The study indicated that rice residue biochar has potential for ameliorating heavy metal contaminated soils.