Data/hora: 09/06/2024 18:57:05

Biblioteca(s): 	Embrapa Meio-Norte.	
Data corrente: 	09/04/1997	
Data da última atualização: 	09/04/1997	
Autoria: 	TOLLENAAR, M.; DIBO, A. A.; AGUILERA, S. F.; SWANTON, C. J.	
Título: 	Effect of crop density on weed interfernce in maize.	
Ano de publicação: 	1994	
Fonte/Imprenta: 	Agronomy Journal, 86(4):591-595, 1994.	
Idioma: 	Inglês	
Conteúdo: 	Development of an integrated weed management system requires detailed information on crop-weed interactions, including the impact of the relative competitive ability of the crop during various phases of development on weed growth. The objective of this study was to auntify effects of maize (Zea mays L.) plant density on weed interference in maize throughout the growing season. Experiments were carried out during 1990, 1991 and 1992 at the Elora Research Station, Elora, ON, on a London loam (Aquic Hapludalf) soil that had been tile drained. Maize was grown at three plant densities (4,7, and 10 plants m-2) under three weed pressures. Weed pressures were established by varying the weed-free period after maize planting: all season (weed free), planting to 5 to 7-leaf stage of maize (medium weed pressure), and planting to 3 to 4-leaf stage of maize (high weed pressure). Maize and weed biomass and composition were evaluated at 3 wk presilking, silking, 3 wk post-silking, and at physiological maturity. Maize leaf area index, leaf chiorophyll content, and photosynthetic photon flux density transmittance with and without weeds were also measured. Increasing maize plant density from 4 to 10 plants m-2 reduced weed biomass by up to 50%. The impact of high weed-pressure treatments on maize dry matter accumulation remained in a narrow range of 18 to 21% throughout the growing season.	
Palavras-Chave: 	Manejo integrado; Planta daninha; Zea mays L.	
Thesagro: 	Milho.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio-Norte (CPAMN)	
Exemplares: 	CPAMN - (5860-1) - ADC - SP - -- - S 10371 -  - S 10371 - DIS