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摘要
O trabalho teve como objetivo o estudo fitossociol車gico e a determina o dos per赤odos cr赤ticos de interfer那ncia da comunidade infestante na cultura da beterraba transplantada. Os tratamentos consistiram em per赤odos semanais crescentes de conviv那nciae de controle da comunidade infestante, a partir da segunda semana ap車s o transplante das mudas. A comunidade infestante foi avaliada por meio do n迆mero de indiv赤duos e da massa seca acumulada correspondente, para cada popula o de planta daninha e per赤odo avaliado. A cultura foi colhida 91 dias ap車s o transplante das mudas, quando se avaliou o diametro transversal e a produtividade comercial das ra赤zes. As principais plantas daninhas encontradas foram Amaranthus viridis, Coronopus didymus, Galinsoga parviflora, Nicandraphysaloides e Solanum americanum. As popula es encontradas apresentaram alta similaridade entre si. O per赤odo anterior 角 interfer那ncia e o per赤odo total de preven o 角 interfer那ncia foram 51 e 35 dias ap車s o transplante das mudas, respectivamente. A produ o da beterraba mantida no limpo foi 44,92 t ha-1, e a redu o devido 角 interfer那ncia das plantas daninhas por todo o ciclo foi mais de 70%. The objective of this research was to study the phytosociological andcritical interference periods of weed communities on transplanted beets. The treatments consisted of increasing weekly weedy/weed-free periods, starting at the second week after seedling transplanting. The weed community was evaluated based on the number ofindividuals and their corresponding accumulated dry mass, for each weed population and evaluated period. The beets were harvested 91 days after transplanting, followed by evaluation of the cross-sectional diameter and marketable yield. The weed communitieswere composed mainly of Amaranthus viridis, Coronopus didymus, Galinsoga parviflora, Nicandra physaloides and Solanum americanum, and the populations were very similar. The period before weed interference and the total period of weed interference prevention were 51 and 35 days after transplanting, respectively. The beet yield in the weed-free treatment was 44.92 t ha-1 and the reduction from weed interference was more than 70%.
