O objetivo do presente trabalho foi avaliar o uso das águas residuárias no crescimento de espécies arbóreas da caatinga na recuperação de área degradada. O ensaio foi conduzido em condições de campo, em área de degradação agrícola e biológica, na sede do Instituto Nacional do Semiárido, em Campina Grande-PB. Foram testados três tratamentos, com dez repetições cada, seguindo um delineamento em blocos ao acaso, os quais foram distribuídos com: 0,5 litro de água de abastecimento; 1,0 litro de água de efluente doméstico tratado; e 0,5 litro de água de efluente doméstico tratado; todos por planta e para cada irrigação efetuada semanalmente, sendo associadas ao crescimento de espécies nativas da caatinga. Para análise do efeito dos tratamentos foram mensurados aos 216; 312; 346; 421; 514; 594; 724 e 871 dias após o transplantio e, posteriormente determinou-se a taxa de crescimento relativo para a altura de planta nas espécies Aroeira e Sabiá. Os resultados evidenciaram o favorecimento da água residuária sob o crescimento das espécies avaliadas. A irrigação com água residuária favorece a permanência das espécies em área degradada.
The attempt to face the limitations of wood-based materials, especially concerning the relationship with water, is still a considerable gap in research on this subject. The present work proposes the accomplishment of thermal treatment in fiberboard-type hardboard, using different temperatures and times, to evaluate the effect on the physical-mechanical properties. The parameters of the heat treatment were temperatures of 120 and 160 °C and times of 20 and 40 min. The hardboards were individually heat treated in a kiln. The characterization was performed from physical tests such as bulk density, moisture content, water absorption (2 and 24 h), thickness swelling (2 and 24 h); and mechanical properties of flexural strength. The treatment with a temperature of 160 °C for 40 min showed the lowest values of water absorption in 24 h (34%). Thickness swelling was lower compared to control, for all the treatments applied. Regarding flexural strength, the treatment that adopted the 160 °C for 20 min showed the highest MOR value (26.3 MPa). In general, the performance of heat treatments positively influenced the physical and mechanical properties of the hardboards, being an interesting alternative in the development of products for applications in internal environments.
This study aimed to establish a methodology for vegetative propagation via mini-cuttings technique for Mimosa Caesalpiniifolia. For such, three independent experiments were conducted: the first one evaluated survival and production of mini-stumps; the second tested the interaction between mini-cuttings types (apical and intermediate) and different concentrations of indolbutyric acid (IAB; 0, 2,000, 4,000 and 6,000 mg.L-1) on adventitious rooting; and the third analyzed the effect of leaf area reduction (0%, 25%, 50%, 75%, and 100%) on mini-cuttings. Mini-stumps survival at 180 days was 80%, with an average yield of 5 sprouts per mini-stump at 120 days. Apical mini-cuttings demonstrated a higher rooting percentage, without IBA application, higher than 80%. On the other hand, IBA application promotes increased rooting percentage in intermediate mini-cuttings. Treatments without leaf reduction and with reduction of 25% promoted better results concerning rooting and plant development. Results support the hypothesis that mini-cuttings technique is viable for the propagation of Mimosa Caesalpiniifolia.
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