Data/hora: 07/06/2024 07:55:01

Biblioteca(s): 	Epagri-Sede.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	Internacional - B	
Data corrente: 	18/02/2016	
Data da última atualização: 	18/02/2016	
Autoria: 	BALDISSERA, T. C.; PONTES, L. S.; BARRO, R. S.; GIOSTRI, A. F.; GUERA, K. C. S.; MICHETTI, M.; SILVA, V. P.; CARVALHO, P. C. F.	
Título: 	Phyllochron and leaf lifespan of four C4 forage grasses cultivated in association with trees.	
Ano de publicação: 	2014	
Fonte/Imprenta: 	Tropical Grasslands ? Forrajes Tropicales, Colombia, v. 2, p. 12-14, 2014.	
Idioma: 	Inglês	
Conteúdo: 	Silvopastoral systems are emerging as an option for more sustainable land use. However, the challenge is to optimize pasture production and determine suitable management by understanding the growth and development of forages under tree canopies (Palma et al. 2007). In silvopastoral systems, trees change the environment under which forages grow, and can influence the development of plants and, consequently, sward dynamics. For instance, both light quantity (i.e. photon flux density) and quality (e.g. changes in red:far-red ratio) can be influenced by the tree canopy (Beaudet et al. 2011). Phyllochron and leaf lifespan are morphogenic processes that control growth and development of plants by determining leaf area index and thus light interception by the sward (Lemaire and Chapman 1996). Both characteristics can be used as tools for pasture management and are influenced by management practices, like nitrogen fertilization. However, few studies have examined these characteristics for forages under a tree canopy (Paciullo et al. 2008), particularly when using light interception (LI) as a criterion for cutting frequency. Under full sun, rotational stocking using 95% canopy LI has been recommended for using C4 species to their fullest potential and to optimize ruminant weight gains on pastures (da Silva and Carvalho 2005). The aim of our work was to determine the effects of shading (5-year-old plantation of Eucalyptus dunnii) and nitrogen availability on phyllochron and leaf lifespan of four C4 forage grasses in a subtropical environment, using the 95% light interception criterion to determine cutting frequency.	
Palavras-Chave: 	cutting frequency; light interception; Morphogenesis; nitrogen.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_37008.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
Exemplares: 	Epagri-Sede - (99895-1) - UPC - AP - DD -  -  -  - DIS