Produtividade de alface cv Lucy Brown influenciada por períodos de convivência com plantas infestantes e potencial alelopático da tiririca

• Autor(a) principal: Melhoranca Filho, Andre Luiz [UNESP]
• Data de Publicação: 2008
• Outros Autores: Rocha Pereira, Maria Renata [UNESP], Martins, Dagoberto [UNESP], Castro, Rodrigo Martinez [UNESP], Nascimento, Martha Santana [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.seer.ufu.br/index.php/biosciencejournal/article/view/6738; http://hdl.handle.net/11449/841
• topic: Competition; Harmful plants; Lettuce

This work was divided in two experiments, the first one to evaluate the lettuce productivity (cv Lucy Brown - American group) influenced by increasing and decreasing periods of coexisting with harmful plants, and a second moment, aiming at to evaluate the allelopathic potential of nutsedge (Cyperus rotundus L.) on the initial lettuce development.The experimental treatments constituted of six increasing and decreasing periods of coexisting with harmful plants, or control of it in the culture, considered from the plantation of the lettuce; being separate in two groups: Weeds and Clean weeds.In the second moment of the experiment, purple nutsedge aerial parts had been collected in the area of experiment 1, that drying had been after triturated and immersed in methylic alcohol P. A in ratios 10, 5,0 and 2.5% (w/ v) and later impregnated in germination paper, where had been placed lettuce seeds.The analyses of results, one concludes that the presence of C. rotundus plants can intervene with the germination, growth and development of the plants of lettuce cv Lucy Brown, and that initial periods of coexisting between the culture and the harmful are associate to an induction of the foliar area development, and can not express the reduction of productivity in the end of the cycle. Drawn out periods of competition induce the reduction of the lettuce foliar area, and then they will intervene with the yield productivity.