Algas marinhas como bioestimulantes no crescimento inicial de espécies florestais da Caatinga
Several studies have demonstrated the beneficial effects of applying algae extracts to plants, such as improved germination and plant establishment. Despite some examples of commercial use, almost all of the algae biomass is not used by the population. Considering its high nutritional value, there i...
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| Formato: | Dissertação |
| Idioma: | por |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/23932 |
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| Resumo: | Several studies have demonstrated the beneficial effects of applying algae extracts to plants, such as improved germination and plant establishment. Despite some examples of commercial use, almost all of the algae biomass is not used by the population. Considering its high nutritional value, there is great potential for the commercial use of algae as substrate. Therefore, in order to contribute to the development of technologies for use of algae in the production of seedlings for reforestation and sustainable exploitation, we analyzed the effects of algae collected on the coast of the RN on the growth of Caatinga endemic species. Different concentrations (0, 15, 20, 25, 30, 35 and 40 g kg-1) of seaweed powder (SP) were tested with a prepared substrate containing clay, bovine manure and sand. Initialy there was a negative effect of the SP on the growth of both species, probably because a negative effect on the germination speed. However, the stimulation in the absolute growth rate in higher doses for catingueira and intermediates for jucá at 60 days after sowing (DAS) indicates a benefical effect of the SP. At 120 DAS we verified a stimulus in the increase of biomass of the roots and stem diameter in jucá in relation to the increase of SP doses. In this species there was also an increase in the concentration of chlorophylls a, b and carotenoids. The increase in the concentration of pigments in relation to the SP doses also occurred in catingueira. Therefore, we do not recommend the germination of seeds in a substrate containing SP for seedlings production, however, the results presented in this work in long term indicates that the seaweed powder positively influences the initial growth of seedlings of the two endemic Caatinga species when applied in the substrate composition. |
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