Resumo

FREIRIA, Gustavo Henrique et al. Coffee processing residue extracts on the germination and vigor of maize seeds under water stress. Acta Agron. [online]. 2023, vol.72, n.4, pp.330-337.  Epub 08-Maio-2025. ISSN 0120-2812.  https://doi.org/10.15446/acag.v72n4.111859.

Maize (Zea mays L.) is one of the most produced cereals in the world, however, water stress impairs the germination and vigor of its seeds. Agro-industrial residues as the husk and pulp obtained from the processing of coffee fruits (Coffea arabica L.) have high concentrations of total phenolic compounds, substances with antioxidant activity, which, if applied exogenously to plants, can reduce the effects of water stress. Thus, the objective of this study was to evaluate different doses of coffee processing residue extract on the physiological quality of maize seeds under water stress. The experiment was carried out in a completely randomized design, with four replications, in a 5 × 3 factorial scheme, with 5 doses of extract from the husk and pulp of coffee fruits: 0, 2, 4, 8, and 16 ml of extract per kg of seeds-1, at 3 different osmotic potentials: 0.0, -0.2, and -0.4 MPa, on the maize variety IPR 164. The characteristics evaluated werefirst germination count, germination, abnormal seedling, nongerminated seeds, length, and dry matter seedling. Although the extract from coffee fruit processing residues, including husk and pulp, reduced the percentage of abnormal seedlings and non-germinated seeds of the IPR 164 maize variety under water stress conditions (osmotic potential of -0.4 MPa), it did not demonstrate, in the manner it was used, potential as a biostimulant, as it did not alter germination and reduced the initial development of the seedlings.

Palavras-chave : biostimulant; coffee husk; coffee pulp; physiological quality; Zea mays L.

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