ResumoO objetivo do trabalho foi avaliar o efeito de diferentes métodos de quebra de dormência na germinação de Ormosia arborea. Foram utilizados os seguintes tratamentos: imersão em água por 72h; escarifi cação química com ácido sulfúrico 100%; escarifi cação mecânica + embebição por 24h e um grupo controle, sendo que, cada um desses tratamentos foi realizado com fotoperíodos de 12h e 0h. As sementes foram submetidas aos tratamentos de luminosidade durante o período do teste de germinação em duas câmaras de germinação do tipo B.O.D. Utilizou-se o delineamento inteiramente casualizado, com quatro repetições. Maiores percentagens de germinação foram observadas nos tratamentos com escarifi cação química. Não foram encontradas diferenças de percentagem de germinação entre os fotoperíodos de 0h e 12h na espécie estudada. Concluiu-se que as sementes de Ormosia arborea apresentam maiores percentuais de germinação quando submetidas à escarifi cação química e que a luminosidade não exerce infl uencia sobre a germinação dessa espécie. Palavras-chave: Dormência de sementes, Luz, Ormosia arborea AbstractEvaluation of methods to overcome dormancy in the germination of Ormosia arborea (Vell.) Harms. The work aimed to evaluate the effect of different methods to overcome dormancy in the germination of Ormosia arborea. The following treatments were used: 72h of water immersion; chemical scarifi cation with 100% sulfuric acid; mechanical scarifi cation + 24h of imbibing and group control, each treatment being carried out with 12h and 0h photoperiods. The seeds undertook luminosity treatments within the period of germination testing in two germination chambers, BOD model. A completely randomized design was used, with four replications. Greater germination percentages were observed in treatments with chemical scarifi cation. There were no germination percentage differences between the 0h and 12h photoperiods in the species under study. One concludes Ormosia arborea seeds present greater germination percentages when undertaking chemical scarifi cation, and luminosity has no infl uence over the germination of this species.
The aim of this study was to assess the effect of subdoses of 2,4-D + picloram on the emergence and initial growth of Hymenaea stigonocarpa. Three experiments were carried out. In the first one, the seeds were planted in sand with residues of 2,4-D + picloram (0; 0.02; 0.10; 0.20 and 0.40 L ha -1 ). The second experiment was conducted with seedlings, using the same treatment of experiment I. In experiment III, the seeds were planted in Red Latosol contaminated with subdoses of 2,4-D + picloram (0; 0.02; 0.08; 0.24; 0.48 and 0.96 L ha -1 ). The contamination of the sand substrate with subdoses of 2,4-D + picloram inhibits the emergence and senescence of Hymenaea stigonocarpa plants. Moreover, when seeds of this species were cultivated in Red Latosol with residual doses between 0.04 and 0.96 L ha -1 , emergence and emergence speed index declined.
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