Influence of heavy metals on urea transformation in a saline soil
2002
Gupta, S., All India Soil and Land Use Survey, Ahmedabad (India | Chaudhry, M.L., Chaudhary Charan Singh Haryana Agricultural University, Hisar (India). Dept. of Soil Science
A laboratory experiment was conducted to study the effect of four heavy metals, viz. Ni, Zn, Pb and Hg on urea transformation in a saline soil at 15 and 30°C. In this saline soil, urea was completely hydrolysed within 3rd and 7th day at 30°C. Low temperature along with heavy metals delayed the hydrolysis of urea, significantly. The NH+4-NN persisted for a longer period in this soil at low temperature. Higher concentration of metal ions (400 mg/kg soil) further delayed the nitrification in the order: Hg Zn Ni Pb. Transformation of NH+4-N to NO3--N was affected both by metal ions and temperature.
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