In this work we investigated how amending a sandy loam agricultural soil with biochar (BC) at a rate of 2% (w:w) affected the sorption dissipation and leaching processes of the two enantiomers of the monoterpene carvone (R-carvone and S-carvone). Sorption of carvone in unamended and amended soil was a non-enantioselective process and the addition of the amendment enhanced the sorption capacity of the soil for both enantiomers. In addition carvone enantiomers showed greater resistance to be desorbed in BC-amended soil than in unamended soil. Dissipation of carvone in the soil was microbial-mediated and enantioselective with S-carvone being degraded more quickly than R-carvone. Furthermore the addition of BC increased the persistence of both enantiomers in the soil. Leaching of R- and S-carvone through soil columns was scarce for unamended soil (< 7%) and null for BC-amended soil for which much of the applied R- and S-carvone remained in the (amended) top 0-5 cm soil layer. Total recoveries of both enantiomers were greater for BC-amended soil columns than for unamended soil columns indicating reduced degradation in BC-amended soil. Our findings show that addition of biochars could help increase the persistence of carvone enantiomers in the topsoil where they may exert biological functions.

Comunicación oral presentada en el 8th International Symposium of Interactions of Soil Minerals with Organic Components and Microorganisms (ISMOM2019) ceblebrado los días 23-28 junio, 2019 Sevilla (España)

Project AGL2017-82141-R from the Spanish Ministry of Science Innovation and Universities and JdC contract IJC-2015-23309.

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