EMERGÊNCIA E ESTABELECIMENTO DE PLÂNTULAS DEGuazuma ulmifoliaLAM. EM FUNÇÃO DE DIFERENTES TRATAMENTOS PRÉ-GERMINATIVOS

Ciencia Florestal

关键词: dormência;    comportamento germinativo;    estabelecimento.;   

DOI  :  10.5902/1980509824205

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Pesquisas Florestais

【 摘 要 】

This study tested the influence of mechanical and thermal scarification methods on emergence and establishment ofGuazuma ulmifoliaseedlings. Seeds were subjected to pre-germination treatments of (1) mechanical scarification (sandpaper), and (2) thermal scarification (hot water), in addition to the control treatment (3) from which the seeds were left intact. The thermal scarification treatment differed from the other treatments featuring the largest number of seedling emergence (70%). The seeds treated with sandpaper achieved the lowest emergence percentage not differing from the control treatment. For the germination speed index no significant difference between treatments has been verified and the emergence peak was between the 13 rdand 15 thdays of incubation in all treatments. In the establishment, the seedlings growth (height, diameter and number of leaves and nodes) presented differences between the treatments. It was observed further development of seedlings after their seeds go through thermal scarification. Therefore, scarification with hot water is the most appropriate method for breaking the dormancy of seeds ofGuazuma ulmifolia , providing more vigorous seedlings.

【 授权许可】

CC BY-NC