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Assessing biochar and hidrochar's ability to reduce bioavailability of herbicides and metabolites in soils

Grant number: 16/17683-1
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): May 01, 2017
Effective date (End): March 03, 2019
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:Valdemar Luiz Tornisielo
Grantee:Kassio Ferreira Mendes
Home Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil


The application of biochar to soils has been known for some time to increase herbicide sorption and reduce efficacy. Overall, there is the assumption that increased soil sorption could reduce leaching of herbicides to groundwater, thus improving overall water quality. On the other hand, increased sorption leads to decreased efficacy of soil applied herbicides thereby eliminating the residual action of these chemicals for weed management. However, the sorption potential of hydrochars for herbicides in soil has been rarely investigated. The aim of this study will be to evaluate the effect of amending soils with soybean stover, sugarcane bagasse, and wood chips derived biochars and hydrochar or same raw feedstocks on the sorption-desorption, mineralization, and degradation of mesotrione, diuron, hexazinone, aminocyclopyrachlor, metolachlor, indaziflam, and three indaziflam metabolites (indaziflam-triazinediamine, indaziflam-triazine-indanone, and indaziflam-carboxilic acid). Soil will be amended at 10% (w/w), and sorption-desorption studies will be performed in duplicate using the batch equilibration method. Soils will be treated with 14C-herbicides, and will be incubated for 30 days to mineralization and degradation. Overall, the comparison of the impact of biochar on herbicide sorption is narrow due to the limited number of studies utilizing biochar. Furhermore, the lack of information within these studies to properly characterize the biochar material used further limits the ability to compare results. However, based on the analogous observations with non-biochar materials, the overall conclusions will be that biochar additions will increase sorption, decrease dissipation rates, decrease leaching and movement of the herbicide in the soil, and reduce the bioavailability of the herbicide, which could lead to reduced efficacy. (AU)

Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
JUNQUEIRA, LEONARDO VILELA; MENDES, KASSIO FERREIRA; DE SOUSA, RODRIGO NOGUEIRA; ALMEIDA, CASSIO DE SOUZA; ALONSO, FELIPE GIMENES; TORNISIELO, VALDEMAR LUIZ. Sorption-desorption isotherms and biodegradation of glyphosate in two tropical soils aged with eucalyptus biochar. ARCHIVES OF AGRONOMY AND SOIL SCIENCE, NOV 2019. Web of Science Citations: 0.
MENDES, KASSIO FERREIRA; OLIVATTO, GLAUCIA PEREGRINA; DE SOUSA, RODRIGO NOGUEIRA; JUNQUEIRA, LEONARDO VILELA; TORNISIELO, VALDEMAR LUIZ. Natural biochar effect on sorption-desorption and mobility of diclosulam and pendimethalin in soil. Geoderma, v. 347, p. 118-125, AUG 1 2019. Web of Science Citations: 0.
MENDES, KASSIO FERREIRA; DE SOUSA, RODRIGO NOGUEIRA; TAKESHITA, VANESSA; ALONSO, FELIPE GIMENES; JUSTINIANO REGO, ANA PAULA; TORNISIELO, VALDEMAR LUIZ. Cow bone char as a sorbent to increase sorption and decrease mobility of hexazinone, metribuzin, and quinclorac in soil. Geoderma, v. 343, p. 40-49, JUN 1 2019. Web of Science Citations: 4.
KASSIO FERREIRA MENDES; FELIPE GIMENES ALONSO; TATIANE BEATRIZ MERTENS; MIRIAM INOUE; MARCELO GOMES DE OLIVEIRA; VALDEMAR LUIZ TORNISIELO. Aminocyclopyrachlor and mesotrione sorption–desorption in municipal sewage sludge-amended soil. Bragantia, v. 78, n. 1, p. 131-140, Mar. 2019.
MENDES, KASSIO FERREIRA; ALONSO, FELIPE GIMENES; MERTENS, TATIANE BEATRIZ; INOUE, MIRIAM; DE OLIVEIRA, MARCELO GOMES; TORNISIELO, VALDEMAR LUIZ. Aminocyclopyrachlor and mesotrione sorption-desorption in municipal sewage sludge-amended soil. Bragantia, v. 78, n. 1, p. 131-140, JAN-MAR 2019. Web of Science Citations: 0.
MENDES, KASSIO FERREIRA; HALL, KATHLEEN E.; TAKESHITA, VANESSA; ROSSI, MONICA LANZONI; TORNISIELO, VALDEMAR LUIZ. Animal bonechar increases sorption and decreases leaching potential of aminocyclopyrachlor and mesotrione in a tropical soil. Geoderma, v. 316, p. 11-18, APR 15 2018. Web of Science Citations: 6.

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