Journal of Environmental Biology

Release of zinc and cadmium from sludge amended soil as

influenced by varying levels of moisture and temperature

Debasis Golui, S.P. Datta*, R.K. Rattan, B.S. Dwivedi, M.C. Meena and K.K. Bandyopadhayay

Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi-110012, India

*Corresponding Author?s E-mail: spdatta.manish@gmail.com

 Publication Data

Paper received:

26 March 2014

Revised received:

27 August 2014

Accepted:

02 September? 2014

Abstract

Limited information is available related to the effect of moisture and temperature on release of metals from sludge treated soils. In an incubation experiment, effect of ten levels of sludge (0, 1.12, 2.24, 4.48, 8.96, 17.9, 35.8, 71.6, 142, 285 g kg^-1), two levels of moisture (field capacity and 2.5 cm standing water) and two levels of temperature (20 and 35 ^oC) on the release of zinc and cadmium was evaluated in acid and alkaline soils. The results indicated that application of sludge was more effective in enhancing EDTA extractable Zn and Cd in acid soil than in alkaline soil. On an average, maximum increase in release of EDTA extractable Zn and Cd were 32.0 and 5.2 fold in sludge treated soil over control. There was decrease in EDTA extractable Zn and Cd by 37.7% and 25.4%, respectively under submergence as compared to that under field capacity. On an average, the amount of EDTA extractable Zn and Cd increased by 22.6% and 43.6%, respectively at 35 ^oC than that at 20 ^oC.     

 Key words

Acid and alkaline soils, Moisture, Metal release, Sludge, Temperature 

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