Revista Brasileira De Herbicidas 2012; 11(2): 139-147
Mechanical and chemical control of weeds in ares in recovery
The objective of this study was to evaluate the effects of application of glyphosate and paraquat compared to mowing to control invasive grasses in degraded areas. For the present study, the area was divided into two areas with different values of penetration resistance of soil and the fresh weight of the shoots. In each environment were selected five plots of 6×6 m². Each plot was divided into four subplots receiving treatments: glyphosate (1,44 kg ha-1), paraquat (0,40 kg ha-1), mowing and mechanical control (without herbicide and mowing). Evaluations were carried out on measurements of photosynthetically active radiation intercepted by the grass after treatment application, and estimating the total microbial activity on the basis of the evaluated and a control area. It has been found that cutting is treatment that allows higher incidence of light on the ground and paraquat application that allows a lower incidence of light. The plots treated with paraquat was hardly the arrival of new species, but shoots of the species present before. The highest rates of metabolic coefficient were found in the environment to be recovered. However, other recovery techniques must be adopted concurrently with the management for the control of species weeds.
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