Amendments with pyrolyzed agrowastes change bromacil and diuron's sorption and persistence in a tropical soil without modifying their environmental risk.

Autor: Chin-Pampillo JS; Centro de Investigación en Contaminación Ambiental (CICA), Universidad de Costa Rica, Costa Rica; CREAF, E08193, Bellaterra, (Cerdanyola del Vallès), Catalonia, Spain; Universitat Autònoma de Barcelona, E08193 Bellaterra (Cerdanyola del Vallès), Catalonia, Spain. Electronic address: juan.chin@ucr.ac.cr., Perez-Villanueva M; Centro de Investigación en Contaminación Ambiental (CICA), Universidad de Costa Rica, Costa Rica., Masis-Mora M; Centro de Investigación en Contaminación Ambiental (CICA), Universidad de Costa Rica, Costa Rica., Mora-Dittel T; Centro de Investigación en Contaminación Ambiental (CICA), Universidad de Costa Rica, Costa Rica., Carazo-Rojas E; Centro de Investigación en Contaminación Ambiental (CICA), Universidad de Costa Rica, Costa Rica., Alcañiz JM; CREAF, E08193, Bellaterra, (Cerdanyola del Vallès), Catalonia, Spain; Universitat Autònoma de Barcelona, E08193 Bellaterra (Cerdanyola del Vallès), Catalonia, Spain., Chinchilla-Soto C; Centro de Investigación en Contaminación Ambiental (CICA), Universidad de Costa Rica, Costa Rica., Domene X; CREAF, E08193, Bellaterra, (Cerdanyola del Vallès), Catalonia, Spain; Serra Húnter Fellow, Universitat Autònoma de Barcelona, E08193 Bellaterra (Cerdanyola del Vallès), Catalonia, Spain.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2021 Jun 10; Vol. 772, pp. 145515. Date of Electronic Publication: 2021 Feb 01.
DOI: 10.1016/j.scitotenv.2021.145515
Abstrakt: Knowledge of pesticides fate in tropical soils and how it could be affected by pyrolyzed biomass as amendment is limited. Combining conventional and radiotracer methods, as well as risk assessment tools, the effects of several charred agrowastes on the sorption, persistence, and ecological risk of the herbicides bromacil (BMC) and diuron (DRN) were evaluated in a tropical agricultural soil under laboratory conditions. Pineapple stubble (PS), palm oil fiber (PF), and coffee hull (CH) were charred at 300 (torrefied) and 600 °C (biochar) and applied to the soil at 10 and 20 t ha -1 rates. The sorption coefficients (Koc) in unamended soil for BMC and DRN were 18.4 and 212.1 L kg -1 , respectively. The addition of torrefied PS and PF caused a 3 to 4-fold increment in BMC sorption and a 3 to 6-fold change in DRN's sorption. The only biochar that affected the sorption was PS that increased DRN's sorption 3.5 times. The application of coffee hull materials had no significant effect. In terms of degradation (half-life, DT50), for unamended soil BMC's degradation (300 days) was limited compared to DRN (73 days). Alternatively, biodegradation (mineralization half-life time, MT50) was 1278 d for BMC and 538 for DRN. While only PF and CH torrefied increased BMC's persistence, all the torrefied affected DRN's persistence. However, despite the observed effects, the predicted ecological risk was not mitigated. Our results highlight the need for scientific evidence on the use of pyrolyzed organic amendments to assess potential benefits and prevent unintended impacts in tropical agroecosystems.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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