Biochar Soil Additions Affect Herbicide Fate: Importance of Application Timing and Feedstock Species

• DOI: 10.1021/acs.jafc.7b00458
• Publication Date: 2017-03-29T14:27:52Z
• Authors: Beatriz Gámiz; Pilar Velarde; Kurt A. Spokas; M. Carmen Hermosín; Lucía Cox
• Keywords: Affect

Biochar (BC), solid biomass subjected to pyrolysis, can alter the fate of pesticides in soil. We investigated effect soil amendment with several biochars on efficacy two herbicides, clomazone (CMZ) and bispyribac sodium (BYP). To this aim, we evaluated CMZ BYP sorption, persistence, leaching biochar-amended Sorption was greater amended BC produced at high temperature (700 °C). Significant sorption neutral herbicide also occurred prepared low (350 500 For both desorption possessed higher hysteretic behavior made 700 °C (pyrolysis temperature). Dissipation enhanced after addition BCs soil, but no correlation between persistence observed. Persistence up 3 times when added All suppressed as compared unamended Amendment inhibited action against weeds, 350 had such activity similar that exhibited by BC. From these results, biochar amendments be a successful strategy reduce environmental impact However, phytotoxicity soil-applied herbicides will depend characteristics pesticide's chemical properties, well pesticide application timing (e.g., pre- or postemergence). According our proper screening intended light mode (pre- postemergence) is required prior use ensure adequate efficacy.