Abstract
Agromining involves growing selected hyperaccumulator plant species (‘metal crops’) on low-grade ore bodies or mineralized (e.g. ultramafic) soils, or anthropogenic metal-rich materials (e.g. contaminated soils, mine spoils, industrial sludge), followed by harvesting and incineration of the biomass to produce a ‘bio-ore’ from which target metals or salts may be recovered. This chapter begins with an introduction section that clarifies the concepts of phytomining and agromining. We then acknowledge the role of agronomy in enhancing the metal yield of ‘metal crops’, with emphasis on Ni. Highlighted are the selection of sites section, potential agromining substrates and discussion of the role of metal phytoavailability in economic agromining. We present the criteria for selecting potential ‘metal crops’ and possible regions where these species are most suited for successful agromining operations. We then discuss thoroughly the experimentally demonstrated soil and plant management practices that have been proposed to increase biomass and the metal yield of ‘metal crops’. We report also on progress of the pioneering tropical agronomic trials. Finally, we provide a conclusion and present an outlook on the agronomy of ‘metal crops’ that may be used in agromining.
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Nkrumah, P.N., Chaney, R.L., Morel, J.L. (2021). Agronomy of ‘Metal Crops’ Used in Agromining. In: van der Ent, A., Baker, A.J., Echevarria, G., Simonnot, MO., Morel, J.L. (eds) Agromining: Farming for Metals. Mineral Resource Reviews. Springer, Cham. https://doi.org/10.1007/978-3-030-58904-2_2
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