Data/hora: 04/06/2024 04:39:22

Biblioteca(s): 	Embrapa Pecuária Sudeste.	
Data corrente: 	07/01/2014	
Data da última atualização: 	10/03/2023	
Autoria: 	HIJANO, N.; MONQUERO, P. A.; MUNHOZ, W. S.; GUSMAO, M. R.	
Afiliação: 	N. HIJANO, Universidade Federal de São Carlos; P. A. MONQUERO, Universidade Federal de São Carlos; W. S. MUNHOZ, Universidade Federal de São Carlos; MARCOS RAFAEL GUSMAO, CPPSE.	
Título: 	Herbicide selectivity in alfalfa crops.	
Ano de publicação: 	2013	
Fonte/Imprenta: 	Planta Daninha, Viçosa-MG, v. 31, n. 4, p. 903-918, dec. 2013.	
DOI: 	https://doi.org/10.1590/S0100-83582013000400017	
Idioma: 	Português	
Conteúdo: 	This study aimed to determine the selectivity of herbicides applied in pre- and post-emergence for alfalfa crops. Three separate experiments were carried out under greenhouse conditions. The first experiment was arranged in a completely randomized design with three replications in a 4 x 11 + 1 factorial scheme , with eleven herbicides (bentazon, chlorimuron-ethyl, fomesafen, fluazifop-p-butyl, saflufenacil, imazethapyr, clethodim, nicosulfuron, imazaquin, haloxyfop-methyl and MSMA), four doses of each herbicide (0.5 D, 0.75 D, 1.0 D and 1.25 D, where D = recommended dose), plus an untreated control. The products were applied to alfalfa plants at the stage of 4 to 5 leaf pairs. In the second experiment, the effect of pre-emergent herbicides on early alfalfa development was observed through a completely randomized design with five replications in a 3 x 4 x 2 factorial scheme, with three herbicides (hexazinone, atrazine + simazine, S-metolachlor), four doses (0.5 D, 0.75 D, 1.0 D and 1.25 D), and two types of soil texture (loamy and clay soil), plus an untreated control. The third experiment evaluated the action of atrazine, 2,550 g ha-1; clomazone - 600 g ha-1; diclosulam - 25 g ha-1; diuron+hexazinone - 936 + 264 g ha-1 and diuron+hexazinone +sulfometuron - 1,386 + 391 + 33.35 g ha-1 on alfalfa sown at different times after herbicide application. The effects of the treatments on alfalfa were evaluated according to visual phytotoxicity symptoms, plant height, and biomass of roots and shoots. Among the herbicides applied at post-emergence, imazethapyr, clethodim, haloxyfop-p-methyl and MSMA were selective for alfalfa, while among those applied at pre-emergence, none were selective, regardless of soil texture. The results of the third experiment showed that the herbicides diclosulam, hexazinone + diuron and atrazine caused less toxicity in alfalfa plants.	
Palavras-Chave: 	Período residual.	
Thesagro: 	Fitotoxicidade; Medicago Sativa.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/94755/1/PROCI-2013.00218.pdf	
Registro original: 	Embrapa Pecuária Sudeste (CPPSE)	
Exemplares: 	CPPSE - (22277-1) - UPC - AP - DD - PROCI-2013.00218 - HIJ - 2013.00218 - DIS