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Impact of Humic Acids on Phosphorus Retention and Transport
Journal of Soil Science and Plant Nutrition ( IF 3.9 ) Pub Date : 2020-07-30 , DOI: 10.1007/s42729-020-00308-9 Yudi Wu , Simeng Li , Gang Chen
Journal of Soil Science and Plant Nutrition ( IF 3.9 ) Pub Date : 2020-07-30 , DOI: 10.1007/s42729-020-00308-9 Yudi Wu , Simeng Li , Gang Chen
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.
更新日期：2020-07-30
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