Data/hora: 25/06/2024 17:38:03

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	18/06/2015	
Data da última atualização: 	23/07/2018	
Autoria: 	TREZZI, M. M.; VIDAL, R. A.; PATEL, F.; MIOTTO JUNIOR, E.; DEBASTIANI, F.; BALBINOT JUNIOR, A. A.; MOSQUEN, R.	
Afiliação: 	UTFPR; UFRGS; UTFPR; UTFPR; UTFPR; ALVADI ANTONIO BALBINOT JUNIOR, CNPSO; UTFPR.	
Título: 	Impact of Conyza bonariensis density and establishment period on soyabean grain yield, yield components and economic threshold.	
Ano de publicação: 	2015	
Fonte/Imprenta: 	Weed Research, [S. l.], v. 55, n. 1, p. 34-41, Feb. 2015.	
ISSN: 	1365-3180	
DOI: 	10.1111/wre.12125	
Idioma: 	Inglês	
Conteúdo: 	Conyza spp. have become a major weed around the world, mainly because of weed resistance issues. The objective of this work was to test the hypothesis that the soyabean crop yield is dependent on the density of Conyza bonariensis and on the timing of weed estab- lishment in relation to the crop sowing date. It was also theorised that these variables affect soyabean crop yield components and the economic threshold of C. bonariensis on soyabean. Field experiments were conducted during 2010 and 2011 using a randomised complete block design. In each experiment, several densities (0, 3, 6, 12, 24, 48, 96 and 192 plants m-2) of C. bonariensis were established in soyabean fields. Conyza bonariensis establishment dates varied consid- erably between the experiments [81, 38 and 0 days before soyabean sowing (DBSS)]. Conyza bonariensis plants were first cultivated in a glasshouse and then transplanted to the field at the three-leaf growth stage. At the lower densities, each C. bonariensis plant decreased soyabean yield by 36%, 12% and 1.0%, when established at 81, 38 and 0 DBSS respectively. The economic thresholds based on sensitivity analysis were below 0.5 plant m-2 when C. bonariensis was introduced at 81 and 38 DBSS; in contrast, they were between 2 and 4 plants m-2 when the weed was estab- lished at the crop sowing time. The results emphasise the importance of proper C. bonariensis management prior to soyabean sowing and highlight the need for residual herbicides to avoid grain yield losses.	
Thesagro: 	Erva daninha; Soja.	
Thesaurus Nal: 	Soybeans; Weeds.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Soja (CNPSO)	
Exemplares: 	CNPSO - (35919-1) - UPC - AP - DD -  -  -  - DIS