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Impact of Humic Acids on Phosphorus Retention and Transport

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Journal of Soil Science and Plant Nutrition Aims and scope Submit manuscript

Abstract

Phosphorus (P) loss is undesirable but prevalent in agricultural fields, as its leaching into natural water bodies usually triggers algae blooms and hypoxic conditions hazardous to aquatic ecosystems. In many developing countries, animal manure, which usually contains high levels of N, P, and organic matter, is directly applied as an economic fertilizer. While the manure-related greenhouse gas (GHG) emission issues have been widely discussed, the impacts of manure applications on nutrient leaching has been rarely discussed. In this study, we have investigated the impact of humic acid (HA) (i.e., a major derivative during manure degradation) on the adsorption and transport of P in goethite-coated silica sand through a series of batch isotherms and column experiments under steady-state flow conditions. The results show that 40 mg L−1 HA could lower the maximum adsorption capacity of goethite-coated silica (for P) by ~ 60%, leading to an increase in P leaching by ~ 70% in the media. This research demonstrates the negative impact that HA applications may have on P retention in agricultural fields.

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Funding

The work was supported by National Natural Science Foundation of China (Grant No. 41572295) and Youth Innovation Promotion Association CAS (No. 2015272 and 2017376). This work was also supported by USDA-NIFA Grant No. 2016-67020-25275 and Department of Energy Minority Serving Institution Partnership Program (MSIPP) managed by the Savannah River National Laboratory under SRNS contract DE-AC09-08SR22470.

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Correspondence to Simeng Li.

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Wu, Y., Li, S. & Chen, G. Impact of Humic Acids on Phosphorus Retention and Transport. J Soil Sci Plant Nutr 20, 2431–2439 (2020). https://doi.org/10.1007/s42729-020-00308-9

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  • DOI: https://doi.org/10.1007/s42729-020-00308-9

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