ADAPTABILIDADE E ESTABILIDADE DE CULTIVARES DE AVEIA À REDUÇÃO DO USO DE FUNGICIDA COM PRODUTIVIDADE SATISFATÓRIA

Abstract

Purpose: The objective of the study is to identify oat cultivars with satisfactory productivity and adaptability to reduced use of fungicide concomitant with the longest interval between the last application and grain harvest, in the recommendation of biotype more adjusted to agroecological management.   Method/design/approach: The study was developed in 2018, 2019, in Augusto Pestana, RS, Brazil. The experimental design was a randomized block with three replications in a 23 x 5 factorial, for 23 Brazilian oat cultivars and 5 fungicide use conditions, applied on the time scale every 15 days cumulatively: control (no application); one application 60 days after emergence (DAE); two applications at 60, 75 DAE; three applications at 60, 75, 90 DAE and four applications at 60, 75, 90, 105 DAE.   Results and conclusion: Experimental strategies with the analysis of adaptability and stability help to identify oat cultivars that are more resilient to the absence or reduction of fungicide use, promoting more sustainable management. The cultivars URS Brava and URS Altiva present satisfactory productivity with adaptability to the absence or reduced use of fungicide, providing a safe interval from the last application to the grain harvest, with the indication for agroecological management. It is necessary to promote food security based on new scenarios, including the environment, technology, economy and society.   Originality/value: Unprecedented study seeking to reduce the use of fungicidal pesticides to control oat diseases using adaptability and stability models, providing opportunities for the analysis of different scenarios to identify cultivars more suited to agroecological management.