THRESHOLD VALUES OF ARSENIC, CADMIUM AND LEAD IN SOIL FOR RICE (ORYZA SATIVA L.) AND KALMI (IPOMOEA AQUATICA) Page No: 4029-4037

Swarnali Mahmood, M Shahjahan Choudhury and SM Imamul Huq

Keywords: Dry matter yield, threshold value, arsenic.

Abstract: A pot experiment was conducted to assess the threshold values of arsenic (As), cadmium (Cd) and lead (Pb) in soil for rice (Oryza sativa L.) and kalmi (Ipomoea aquatica). Rice and kalmi were grown on a silt loam soil treated separately with different levels of As (0, 0.5, 1, 2 and 5 mg As/L of irrigation water), Cd (0, 5, 10, 15 and 20 mg Cd/kg soil) and Pb (0, 25, 50, 100 and 200 mg Pb/kg soil). The contents of As, Cd and Pb in soil for 10% reduction in dry matter yield of rice and kalmi were taken as the threshold values which were 14.10 mg, 4.34 mg and 46.17 mg per kg soil for As, Cd and Pb, respectively, while the same for kalmi were 4 mg, 6.57 mg and 34.84 mg per kg soil, respectively, for the three elements.



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