Resumo -O objetivo deste trabalho foi o de avaliar o efeito de doses do paraquat e do glyphosate na dessecação da forrageira Brachiaria ruziziensis, na capacidade de rebrota e na formação de biomassa para o sistema de Integração Agricultura-pecuária. O delineamento experimental foi de blocos casualizados com quatro repetições. As doses do glyphosate foram 0, 90, 180, 360, 720 e 1440 g ha -1 e do paraquat foram 0, 50, 100, 200, 400 e 800 g ha -1 . Com base nos resultados obtidos pode-se concluir que o paraquat foi ineficiente na dessecação da B. ruziziensis e que o glyphosate foi eficiente apenas nas doses de 720 e 1440 g ha -1 . Não houve emissão de novos perfilhos após a dessecação com glyphosate das plantas da forrageira que permitisse utilização prática para manejo no sistema Integração Agricultura-pecuária. Palavras-chaves: herbicida, plantio direto, sistemas de integraçãoAbstract -The objective of this study was to evaluate the effect of doses of paraquat and glyphosate on desiccation Brachiaria ruziziensis, the ability of regrowth and formation of biomass for the integration of crop-livestock system. The experimental design was randomized blocks with four replications. The rates glyphosate were 0, 90, 180, 360, 720 and 1440 g ha -1 and paraquat were 0, 50, 100, 200, 400 and 800 g ha -1 . Based on the results obtained it can be concluded that paraquat was ineffective in desiccation B. ruziziensis and the glyphosate was only effective at rates of 720 and 1440g ha -1 . There was no issuance of new tillers after desiccation with glyphosate plant forage to allow practical use for management in integration of croplivestock system.
-This study aimed to determine the periods of weed interference in the first cycle of 'Fécula Branca' cassava. The experiment was arranged in a randomized block design, with four repetitions. The treatments consisted of eight periods of weed control (25, 50, 75, 100, 125, 150, and 175 days after planting -DAP) and eight periods of coexistence between the weed community and the crop (25, 50, 75, 100, 125, 150, and 175), besides control without weeds and control with weeds until harvest (322 DAP). The predominant weed species with higher relative importance were: Avena sativa, Sorghum halepense, Conyza Canadensis, Euphorbia heterophylla, Raphanus raphanistrum, and Commelina benghalensis. It was concluded that, accepting losses of 1% for root and starch production, the period before interference (PBI) was 66 and 70 DAP; the total period of interference prevention (TPIP) was 88 and 91 DAP and the critical period of interference (CPI) was between 66-88 and 70-91 DAP, respectively. For losses of 5% for root and starch production, the PBI was 87 and 88 DAP, and the TPIP 80 and 81 DAP, respectively; in this case, there was no CPI. Considering the average prices of R$ 218.90 t -1 and R$ 1,191.84 t, paid in 2012 for root and starch production, respectively, and control cost of R$ 300.00 ha -1 , the root and starch production for the period prior to economic loss (WEEPPEL) could be estimated to be 20 and 24 DAP, respectively.Keywords: cassava, Manihot esculenta, weed interference, WEEPPEL.RESUMO -Objetivou-se neste trabalho determinar os períodos de interferências das plantas daninhas no primeiro ciclo da cultura da mandioca Fécula Branca. O delineamento utilizado foi o de blocos casualizados com quatro repetições. Os tratamentos constituíram-se de sete períodos de controle das plantas daninhas (25, 50, 75, 100, 125, 150 e 175 dias após o plantio -DAP) e de sete períodos de convivência entre a comunidade de plantas daninhas e a cultura (25, 50, 75, 100, 125, 150 e 175 DAP), além de testemunha capinada e outra testemunha sem capina, até a colheita (322 DAP). As espécies de plantas daninhas que predominaram e apresentaram maiores índices de importância relativa foram: Avena sativa, Sorghum halepense, Conyza canadensis, Euphorbia heterophylla, Raphanus raphanistrum e Commelina benghalensis. Concluiu-se que, aceitando-se perdas de 1% para produção de raízes e fécula, o PAI foi de 66 e 70 DAP; o PTPI, 88 e 91 DAP; e o PCPI, entre 66 e 88 e 70 a 91 DAP, respectivamente. Para perdas de 5% na produção de raízes e fécula, o PAI foi de 87 e 88 DAP e o PTPI, de 80 e 81 DAP, respectivamente; para este caso, não houve o PCPI. Considerando-se valores médios pagos em 2012 para raízes e fécula de R$ 218,90 t -1 e R$ 1.191,84 t -1
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