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Tebuthiuron and hexazinone dynamics in soils under biochar application

Grant number: 14/18293-7
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): December 01, 2014
Effective date (End): February 28, 2018
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Jussara Borges Regitano
Grantee:Letícia de Pierri
Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Associated scholarship(s):16/16140-4 - Performance of two biochar-MnII-catalysts on tebuthiuron and hexazinone degradation, BE.EP.DR


Soil application of biochar results in agricultural and environmental advantages, improving soils physical-chemical attributes and mitigating greenhouse gases effects. However, biochar can directly interact with pesticides either neutralizing its efficacy or requiring higher application rates, which enhance environmental contamination risks. The interactions between biochar and pesticides depend on soil and molecule properties, in addition to intrinsic biochar attributes that are affected by raw material (biomass) nature and pyrolysis temperature. Generally, there is an increase in sorption and persistence of xenobiotics when applying biochars yielded at high temperatures and with lignified residues. Tebuthiuron and hexazinone are pre-emergent herbicides, economically important to sugarcane production that may be negatively affected by biochar application, but the magnitude of these effects is unknown until the present moment. Therefore, this project aims to evaluate biochar effects on tebuthiuron and hexazinone environmental fate in contrasting soils. It will be assessed by studying: I) soil sorption of hexazinone and tebuthiuron in response to biochars application produced with different biomass types and pyrolysis temperatures; II) effects of biochar rates on Brachiaria control efficacy by these herbicides; and III) dissipation rates of these herbicides after biochar application. It is expected that this work will assist in decision making on the part of technicians, farmers, and legislators regarding the rational and sustainable use of biochar as a soil conditioner in Brazil. (AU)

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Scientific publications
(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)
DE PIERRI, LETICIA; NOVOTNY, ETELVINO HENRIQUE; PELLEGRINO CERRI, CARLOS EDUARDO; DE SOUZA, ADIJAILTON JOSE; MATTOS, BIANCA BRAZ; TORNISIELO, VALDEMAR LUIZ; REGITANO, JUSSARA BORGES. Accessing biochar's porosity using a new low field NMR approach and its impacts on the retention of highly mobile herbicides. Chemosphere, v. 287, n. 3, . (14/18293-7)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
PIERRI, Letícia de. Tebuthiuron and hexazinone fate in soils with biochar amendment. 2018. Doctoral Thesis - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) Piracicaba.

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