Efeitos de diferentes tratamentos pré- germinativos e variabilidade de água na emergência de sementes de schinopsis brasiliensis engl.

Abstract

The objective of this research was to evaluate the influence of different dormancy overcoming methods and resistance to salinity on the emergence of Schinopsis brasiliensis Engl. The experiment was carried out at the Laboratory of Ecology and Botany Laboratory of CDSA / UFCG from August to December 2018. For the dormancy tests three pre-germinative treatments were used: intact seeds - control (T1); mechanical scarification (T2); and Soaking in water at room temperature for 24 hours (T3). For each pre-germination treatment three types of water were used: tap water, mineral water and well water. The following parameters were evaluated: emergence, emergence speed index and seedling dry mass. According to the results obtained, it was found that the pre-germination treatments and the different types of water used in irrigation influenced in all studied parameters. Regarding the emergence percentage, emergence speed index and seedling dry mass it was observed that the mechanical scarification provided the best results with values of 88%, 0.578 and 4.45mg respectively, while the lowest percentages occurred when seeds were not submitted to any pre-germinative treatment. Regarding the influence of water variability, it was observed that the evaluated parameters decreased as irrigation water salinity levels increased. Thus, it was found that salinity interferes negatively on the physiological quality of the seed proportionally to the increase of irrigation water salinity and mechanical scarification was the treatment responsible for the best performances, being recommended for conducting emergence tests of seedlings S. brasiliensis under uncontrolled conditions in the municipality of Sumé-PB.