RESUMOCom o objetivo de avaliar a eficiência de diferentes herbicidas dessecantes e doses, foi conduzido um experimento no Núcleo Experimental de Ciências Agrárias da Universidade Federal de Mato Grosso do Sul, no município de Dourados, MS, no ano agrícola 1995/96. Utilizou-se o delineamento experimental de blocos casualizados e os tratamentos foram compostos por três espécies vegetais [aveia-preta (Avena strigosa), milheto (Pennisetum typhoydes) e capim-marmelada (Brachiaria plantaginea)] e quatro herbicidas dessecantes em três doses cada um: paraquat (0,30, 0,40 e 0,60 kg/ha), glyphosate (0,72, 1,08 e 1,44 kg/ha), sulfosate (0,96, 1,44 e 1,92 kg/ha) e glyphosate+2,4-D (0,54+0,67,0,54+1,0 e 0,54+1,34 kg/ha). Os herbicidas glyphosate, sulfosate e a mistura glyphosate+2,4-D foram eficientes na dessecaçãodas três espécies em todas as doses utilizadas. Houve rebrota das plantas de milheto e de capim-marmelada aos 36 dias após a aplicação de paraquat.Palavras-chave: herbicida dessecante, milheto, capim-marmelada, aveia-preta. ABSTRACT Efficacy of selected herbicides in the desiccation of three plant species for soil coverAn experiment was carried out with the objective of evaluating the efficiency of selected herbicides in the desiccation of three plant species in Dourados (MS), Brazil, in 1995/96. A randomized block design was used in three plant species: black oat (Avena strigosa ), millet (Pennisetum typhoydes) and Brachiaria plantaginea, with four herbicides in three rates: paraquat (0.30, 0.40 and 0.60 kg/ha), glyphosate (0.72, 1.08 and 1,44 kg/ha), sulfosate (0.96, 1.44 and 1.92 kg/ha) and glyphosate+2,4-D (0.54+0.67, 0.54+1.0 and 0.54+1.34 kg/ha). The herbicides glyphosate, sulfosate and the mixture glyphosate+2,4-D were efficient to desiccate the three species in all doses. The plants of millet and Brachiaria plantaginea showed a re-growth after 36 days of the application of paraquat.

This paper is focused on the analysis of energyaware multihop routing metrics for wireless environments which integrate heterogeneous devices that are carried or owned by Internet end-users. The paper gives our own (initial) perspective on how network energy-savings may be improved by considering not only a single (sender) node perspective, but also the perspective of its potential successors when devising energy-aware routing metrics.

This paper proposes and validates routing metrics focused on improving energy-efficiency of multihop approaches in heterogeneous wireless environments. The validation is carried out through discrete event simulations and for the specific case of AODV.

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