Project Number: 1245-12000-040-26
Start Date: Aug 01, 2013
End Date: Jul 31, 2014
A literature review will be conducted of cases of nickel contamination of soils and methods for remediation of Ni contaminated soils. ARS will identify soil properties which promote or reduce Ni phytotoxicity and soil amendments which can strongly reduce the potential for Ni phytotoxicity for sensitive plant species. Fundamental causes of Ni phytotoxicity in relation to soil properties and solubility of Ni ions in soils will be summarized. Examples of using the analysis of causes of Ni phytotoxicity and use of soil amendments to alleviate Ni phytotoxicity will be summarized. A systematic approach to soil and plant analysis to diagnose Ni phytotoxicity will be developed. In addition, present status of Ni phytoextraction and phytomining will be summarized as another method for remediation of Ni phytotoxic soils. As with most areas of research, only part of the literature on Ni in soils and plants is now understood to be relevant to the understanding of practical Ni phytotoxicity. Factors which influence the solubility of Ni in soils, and factors of contaminated soils which interact with Ni loading to influence phytotoxicity will be summarized. The mechanism of soil Ni-induced phytotoxicity will be summarized where it is known. The mechanisms by which soil amendments can persistently alleviate Ni phytotoxicity will be reviewed and applied to development of recommended remediation practices. The potential for Ni phytoextraction to support soil remediation by NiPERA organizations will be summarized. Current best management practices for Ni phytoextraction will be summarized, and approaches to the use of phytoextraction in practice for soil remediation will be summarized.