Respostas de plântulas de angico Anadenanthera macrocarpa (Benth.) Brenan ao alumínio e à calagem

Abstract

Forest species are important to society, not only because they are a source of material, but also because of their role in mitigating the greenhouse effect and urban thermal comfort. Comparing with species of higher economic value, information on the phytotoxic effect of aluminum (Al) in these plants is still scarce. Aluminum (Al) is the main limiting factor for plant development in acid soils. The trivalent form (Al 3+) of this metal is considered the most toxic, causing severe damage to the root system and changes in plant metabolism. The red angico (Anadenanthera macrocarpa (Benth.) Brenam), is a species of economic importance, has a high durability wood being widely used in the civil and naval sector, being a species of rapid growth is widely used in forest restoration plantations. Thus, the objective of this study was to evaluate the effect of aluminum on initial growth and seedling behavior in the presence of this element. Experiments were carried out under different growth conditions: simple nutrient solution with 0.1 mM Al, complete nutrient solution and in soil Red Yellow Latosol using dolomitic limestone under growth chamber conditions. It was also performed under growth chamber conditions (BOD), an experiment to test the effect of different concentrations of aluminum on germination, % abnormal seedlings and mortality rate. The residence time in the substrate of sand germination influenced the response of the seedling to aluminum. The addition of aluminum in level above 100 μM decreased root length and relative root elongation, but did little to affect root growth rate. The liming did not influence the development of the seedlings, but the fertilization with 50 kg / ha of N + 100 kg / ha P205 + 60 kg / ha K20 + 30 kg / ha Kg FTE 12, influenced. The addition of aluminum in germitest paper did not influence germination, % abnormal seedlings and seed mortality. The addition of aluminum in the germitest paper increased the root length of the seedling