The objective of the study was to evaluate the effect of different periods of the interference of species of weeds on the lettuce in greenhouses. It was used a randomized experimental design in blocks with four replications, evaluating four period prior to interference -PPI, which were: 0, 10, 15, 20, 25 days after the transplantation. It was determined the number by species (m -2 ) and fresh and dry mass of weeds (g m -2 ), the head diameter (cm), number of leaves and fresh and dry mass of shoots (g m -2 ) of the lettuce. The accumulated dry mass of the weeds correlated inversely proportional to the assessed characteristics in the lettuce crop. The most affected characteristic by the competition with weed plants was the stem diameter and number of leaves. The weed control in lettuce crop should start soon after transplanting of the seedlings.Keywords: Lactuca sativa L.; competition; weed. ) da alface. A massa seca acumulada das plantas daninhas apresentou correlação inversamente proporcional às características avaliadas na cultura da alface. A característica mais afetada pela competição com plantas daninha foi o diâmetro do caule e no número de folhas. O controle das plantas daninhas na cultura da alface deve iniciar logo após o transplante das mudas. Efeitos de diferentes períodos de interferências de plantas daninhas em Palavras-chave:Lactuca sativa L.; competição; planta daninha. Efectos de diferentes períodos de interferencia de malas hierbas en lechuga en cultivos protegidos ResumenEl objetivo de este estudio fue evaluar el efecto de diferentes períodos de interferencia de especies de malas hierbas sobre la lechuga en cultivo protegido. Se utilizó un diseño de bloques completos al azar con cuatro repeticiones, evaluando cuatro períodos anteriores de interferencia -PAI , que fueron: 0, 10, 15, 20 y 25 días después del trasplante. Se determinó el número por especie (m -2 ) y el peso fresco y peso seco de las malas hierbas (g m -2), el diámetro de la cabeza (cm), número de hojas y peso fresco y seco de la parte aérea de la planta (g m -2) de la lechuga. La acumulación de materia seca de las malas hierbas se mostró inversamente proporcional a las características evaluadas en la lechuga. Las características más afectadas por la competencia con malas hierbas fueran el diámetro del tallo y número de hojas. El control de las malas hierbas en plantas de lechuga debe comenzar poco después del trasplante.Palabras clave: Lactuca sativa L.; competencia; hierbas invasoras.
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