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Ciência Rural

Print version ISSN 0103-8478On-line version ISSN 1678-4596


LORENCETTI, Claudir et al. Implications of fungicide application to adaptability and stability of grain yield in oat. Cienc. Rural [online]. 2004, vol.34, n.3, pp.693-700. ISSN 0103-8478.

Twenty oat genotypes (Avena sativa L.) tested in thirteen environments were submitted to adaptability and stability analyses aiming at evaluating the effects of fungicide utilization following the segmented regression model of CRUZ et al. (1989). Fungicide application affected the parameters of adaptability (b1), responsiveness (b1 + b2) and stability () indicating that estimatives must be performed individually in environments with and without fungicide. Fungicide application had a favorable effect on the stability of grain yield, inasmuch as four of the tested genotypes were shown to be stable (UPF 19, UPF 20, OR-3 e OR-4); however, all genotypes revealed instability of grain yield in the absence of fungicide. No tested cultivar showed characteristics of the ideal genotype, as predicted by the adopted model.

Keywords : Avena sativa L.; segmented regression; responsiveness.

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