Revista Brasileira De Herbicidas 2015; 14(4): 315-325
Physiological characteristics of bean grown in soils after phytoremediation of picloram
Plant remediation has been reported as a promising technique for decontaminating soil herbicide residues. For hormonal herbicides there is difficulty in determining waste by bioassay technique due to the variation in growth in response presented by the indicator plant. The objective of this study was to evaluate the effect of doses of picloram through physiological characteristics of the bean in phytoremdiation soils with braquiaria. The experiment was arranged in greenhouse in the design of randomized blocks. Applied increasing doses of picloram (0; 2; 4; 8; 16 e 32 g ha-1), subsequently cultivated with Brachiaria for 120 days. In this date the brachiaria was harvested and sowed beans as bioindicator, 30 days after the emergence of the culture was evaluated the physiological characteristics and bean biomass accumulation. Even after remediation by plants Brachiaria, the doses of picloram affected the physiological characteristics of the bean, especially the water use efficiency, these variables are the most appropriate to evaluate the herbicide residues in the soil. The reduction of these variables promoted less accumulation of total biomass of bean plants in soils that was made remediation. The second higher dose of the herbicide also caused reduction of Fv / Fm ratio below 0.75, indicating some kind of stress photosynthetic apparatus of bean leaves.
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