Effect of chemical fertilizers on the fractionatio

Authors: Jie Liu ChangQun Duan YiNian Zhu XueHong Zhang ChengXian Wang

Publish Date: 2006/12/21

Volume: 52, Issue: 8, Pages: 1601-1606

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Abstract

Effect of chemical fertilizers urea NH4Cl CaNO32 KCl and KH2PO4 on the fractionation of Cu Cr and Ni was studied by a 4month incubation experiment Using sequential extraction procedure it was found that the application of fertilizers could change the distribution of Cu Cr and Ni in the fractions of soil Applying urea CONH22 significantly decreased the concentrations of Cu Cr and Ni in water soluble plus exchangeable WE fraction but increased those in Fe–Mn oxides bound FM fraction p  001 However application of NH4Cl caused an increase in the WE fraction by 277 for Cu 1115 for Cr and 204 for Ni The CONH22 raised the soil pH from 451 to 496 whereas NH4Cl lowered the pH of soil by 044 units The WE fraction of the three heavy metals was significantly increased while the FM fraction was significantly decreased by adding KCl p  001 Moreover the supply of KH2PO4 reduced the WE and carbonate bound CB fractions of Cu Cr and Ni in the soil however it raised Cu and Ni in the residual RS fraction and Cr in the FM fraction In addition the mobility index indicated that KCl and NH4Cl increased the mobility of Cu Cr and Ni in the soil whereas urea and KH2PO4 decreased the mobility of the three metals in the soil These results suggest that applying chemical fertilizers does not only provide plant nutrients but may also change the speciation and mobility of heavy metals in the soilThis work was cosponsored by the Ministry of Education of China JiaoKeShi 200651 the Provincial Education Department of Guangxi GuiJiaoRen 200429 the Provincial Personnel Department of Guangxi No2004217 and Natural Science Foundation of Guangxi China No0542006 03420014 The authors wish to thank Mr Liang Yanpeng for his help in AAS analysis An anonymous reviewer is thanked for a cogent review of the manuscript

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