Emergence and initial development of peanut seedlings subjected to the use of pyroligneous extract

Abstract

The pyroligneous extract (PE), a product from wood burning, known as pyroligneous acid or wood vinegar, has been studied in several cultures such as corn, beans, rice, capable of exerting effects on germination and seed vigor. Peanut farming is of socioeconomic importance in the regions where it is produced and always seeks to introduce new technologies. In this sense, the aim of this study was to evaluate the influence of the pyroligneous extract on the emergence and initial development of peanut seedlings. The experiment was carried out in a completely randomized design, in a 2x5 factorial scheme, with two peanut cultivars: IAC 503 and Granoleico; and five doses of EP: T1- 10.0 mL of deionized water kg^-1 of seeds; T2- 2.5 mL EP + 7.5 mL deionized water kg^-1 seeds; T3- 5.0 mL EP + 5.0 mL deionized water kg^-1 seeds; T4- 7.5 mL EP + 2.5 mL deionized water kg^-1 of seeds and; T5- 10.0 mL EP kg^-1 of seeds, with 4 repetitions. Sowing was carried out in 11 dm³ polyethylene pots, and the parameters of emergence percentage (E%), emergence velocity index (EVI), aerial part length (APL), root length (RL) and mass were evaluated. seedling dry matter (DM). Data were subjected to analysis of variance by the F test (p>0.05) and treatments by regression analysis. No significant interactions were observed between the simple effects, however, for the Granoleico variety, when EP at a dose of 5 mL Kg^-1 seeds was added, there was an increase in the percentage of emergence, emergence speed index and seedling dry mass^-1. As for the length of both shoots and roots (cm seedlings^-1), higher values were found for 7.5 mL of EP Kg^-1, also for the Granoleico cultivar. It can be concluded that pyroligneous extract at a dose of 5 mL Kg^-1 provided better performance for cultivar Granoleico in the parameters of E%, EVI and APL, while for the cultivar IAC 503 only for the parameter of E%, when compared to the other dosages for that culture.