Resumo

LIMA, Daiane Cristina et al. Fire behavior in different concentrations and post-application of retardants in eucalyptus plantation in Cerrado-Amazonian Transition in Brazil. Rev. de Ciências Agrárias [online]. 2020, vol.43, n.1, pp.226-247.  Epub 22-Jan-2020. ISSN 0871-018X.  https://doi.org/10.19084/rca.18662.

The objective of this study was to evaluate the efficiency of fire retardants submitted to different concentrations and post-application times, during experimental burning of Eucalyptus urograndis plantation (clone H13), in the transition of Cerrado-Amazon biomes from Mato Grosso state, Brazil. Two commercial retardants (Phos-Chek WD881® and Hold Fire®) and one alternative (hydro retainer polymer - Nutrigel®) were evaluated in the syrup volume of 2 L m-2 at different concentrations (Phos-Chek®: 0,1; 0,6; 0,8; 1,0%; Hold Fire®: 0,7; 0,9; 1,1; 1,3; 1,5%; Nutrigel®: 0,0010; 0,0025; 0,0050; 0,0075; 0,0100%) and post-application times on the fuel (litter) (60, 90 and 120 minutes). The in spread of the fire front, the flames length and the percentage of remaining and consumed fuel in the burns were evaluated. The post-application times of 60 and 90 minutes of the retardants in the fuel does not affect the effectiveness of the products, however, after 120 minutes, there is a reduction in fire suppression efficiency. Regardless of the time after application of retardants, the optimal concentrations were 1.0, 1.5 and 0.0060% for Phos-Chek WD881®, Hold Fire® and Nutrigel® for the 2 L m-2 spray volume.

Palavras-chave : experimental burns; chemical firebreaks; fuel; wildfires.

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