Straw, dry period and rain intensity influencing herbicides applied in pre-emergency

• Grant number: 19/12812-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2019
• End date: October 31, 2020
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Patrícia Andrea Monquero
• Grantee: Bruna Ferrari Schedenffeldt
• Host Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil

Abstract

The dry period after an herbicide application, the presence of straw and the amount of rain that occurs after this period are extremely important factors for the correct positioning of herbicides. In this way, the present study aims to evaluate the influence of different periods of indaziflam, amicarbazone and tebuthiuron herbicides on sugarcane straw and soil, before rainfall, on the control effectiveness of Digitaria horizontalis. The experimental design was completely randomized, for each herbicide, in a 3 x 5 scheme, with four replications, three rainfall simulations (0, 10 and 20 mm) and five dry periods (0, 10, 20, 40 and 60 days after application), in addition to controls without application of the product. Six separate experiments will be done taking into account each herbicide applied at the commercial dose on soil without straw and with 10 t ha-1 of straw deposited on the surface. The emergence, percentage of control and development of weed in each treatment will be evaluated. (AU)