Abstract

OLIVEIRA, Augusto M. et al. Sanitary and physiological quality of soybean seeds treated with Eucalyptus spp. essential oils. Rev. de Ciências Agrárias [online]. 2022, vol.45, n.3, pp.41-50.  Epub Sep 01, 2022. ISSN 0871-018X.  https://doi.org/10.19084/rca.26529.

Soybean seeds are usually infested by fungi, and disinfestation has been carried out mainly with synthetic fungicides, however, alternative controls have been sought, including essential oils. Thus, the effect of essential oils extracted from the leaves of the hybrid Eucalyptus tereticornis x E. urophylla (HEtu) and E. grandis x E. urophylla (HEgu) in the sanitary and physiological quality of soybean seeds was evaluated. The sanity test was conducted out in completely randomizes design (CRD), factorial scheme 2x5 (two essential oils, in five concentrations: 0, 0.5, 0.75, 1.0 and 2.0 µL.mL-1), the seeds were placed in gerbox boxes in an incubator at 20 ºC for seven days, the fungi were identified according to their morphology. The physiological quality was evaluated in CRD, factorial scheme 2x4+1, being: two essential oils, in four concentrations (0.5, 0.75, 1.0 and 2.0 µL.mL-1), plus an additional control treated with autoclaved distilled water, after eight days, the percentage of germination, percentage of abnormal seedlings and percentage of dead seeds were evaluated. The oils were efficient in controlling the Fusarium and Cladosporium genera, especially at concentrations of 1.0 and 2.0 µL.mL-1. HEgu oil was more efficient in sanitary control, while HEtu oil was superior in all physiological variables. Despite the greater efficiency in sanitary control, HEgu oil negatively alters the physiological quality of the seeds, while HEtu oil at a concentration of 2.0 µL.mL-1, in addition to the efficiency in phytosanitary control, does not affect the physiological quality of the seeds.

Keywords : sanitary control; Eucalyptus tereticornis x Eucalyptus urophylla; Eucalyptus grandis x Eucalyptus urophylla; monoterpenes; terpenoids.

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