Influence of biochar amendments on the sorption-desorption of mesotrione alone and mixed with the s-metolachlor + terbuthylazine to an agricultural soil

• Grant number: 15/16655-1
• Support type: Scholarships abroad - Research Internship - Doctorate
• Effective date (Start): January 01, 2016
• Effective date (End): June 30, 2016
• Field of knowledge: Agronomical Sciences - Agronomy - Plant Health
• Principal researcher: Valdemar Luiz Tornisielo
• Grantee: Kassio Ferreira Mendes
• Supervisor abroad: Kurt Spokas
• Home Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
• Research place: University of Minnesota (U of M), United States
• Associated to the scholarship: 13/25399-3 - Behavior of herbicides mesotrione + S-metolachlor + terbuthylazine applied in association and alone in soil growing corn, BP.DR

Abstract

The mixture of herbicides is a widely used technique in weed control in various crops such as maize. However, this type of interaction resulting mixture is a matter of constant concern and research, particularly of the herbicide in the soil retention capacity that directly influences the final destination of these molecules in the environment. The many advantageous properties of biochar have led to the recent interest in the use of this carbonaceous material as a soil amendment. However, there are limited studies dealing with the effect of biochar on the behavior of pesticides applied to crops. The objective of this work will be to determine the effect of various biochars on the sorption and desorption of the herbicide mesotrione applied alone and in mixed with S-metolachlor + terbuthylazine in samples to na agricultural soil. 14C-mesotrione (alone and mixed) sorption will be evaluated at different concentrations of 1.25, 2.50, 5.00, 7.50 and 10.00 mg L-1 with the analytical patterns (not radiolabeled) to obtain radioactivities - mesotrione (150 g ha-1), S-metolachlor (1.250 g ha-1) and terbuthylazine (750 g ha-1). Although scarce, studies involving herbicides behavior in with the addition biochar soils are also critical for assessing the efficiency of control of weeds in maize as high sorption rates can compromise the herbicide efficiency. (AU)

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)

MENDES, KASSIO F.; HALL, KATHLEEN E.; SPOKAS, KURT A.; KOSKINEN, WILLIAM C.; TORNISIELO, VALDEMAR L. Evaluating Agricultural Management Effects on Alachlor Availability: Tillage, Green Manure, and Biochar. AGRONOMY-BASEL, v. 7, n. 4 DEC 2017. Web of Science Citations: 3.