impact of sewage irrigation on speciation of nickel in soils and its accumulation in crops of industrial towns of punjab.analysis of soil samples collected from sewage and tube well irrigated soils of ludhiana, amritsar jalandhar and mandi gobindgarh, revealed that diethylene triamine pentaacetic acid extractable nickel ( dtpa-ni) was found to be higher in sewage fed soils. sewage irrigation increased soil dtpa-ni content by 3.04 times over the tube well irrigated soils. the content of dtpa-ni showed decreasing trend with depth. hydrogen concentration (ph) was negatively and significantly correlated with dtpa-ni n ...200819295085
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