Abstract
A recent alternative strategy to reduce environmental problems associated with P transport from agricultural soils is the use of bioenergy crops to remediate excess soil P. In addition to the positive impacts associated with P mitigation, harvested biomass used as a renewable energy source can also offset the cost associated with plant-based P remediation strategies. The objective of this study was to identify potential crop species that can be used for remediation of soil P and as a cellulosic feedstock for production of renewable energy in South Florida. Fifteen crop entries were investigated for their potential to remove P from a P-enriched soil. Dry matter (DM) yield varied among crop species with greatest yield observed for elephantgrass (Pennisetum purpureum Schum.) and sugarcane (Saccharum spp.) (43 and 39 Mg ha−1 year−1, respectively). Similarly, greater P removal rates were observed for elephantgrass (up to 126 kg P ha−1 year−1 in 2008) followed by sugarcane (62 kg P ha−1 year−1 in 2008). Although there was no effect (P = 0.45) of crop species on P reduction in the soil, soil P concentrations decreased linearly during the 3-year study. Because of its relatively greater DM yield and P removal rates, elephantgrass was shown to be a good candidate for remediation of excess soil P in South Florida Spodosols.
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Silveira, M.L., Vendramini, J.M.B., Sui, X. et al. Screening Perennial Warm-Season Bioenergy Crops as an Alternative for Phytoremediation of Excess Soil P. Bioenerg. Res. 6, 469–475 (2013). https://doi.org/10.1007/s12155-012-9267-2
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DOI: https://doi.org/10.1007/s12155-012-9267-2