Data/hora: 21/06/2024 00:56:19

Biblioteca(s): 	Embrapa Agrossilvipastoril.	
Data corrente: 	25/01/2018	
Data da última atualização: 	25/01/2018	
Autoria: 	ARAGÃO, L. S.; ASSIS, H. F.; CAVALLI, J.; TESK, C. R. M.; CARVALHO, P.; PEREIRA, D. H.; SCHIMITD JUNIOR, R. J.; PEDREIRA, B. C. e.	
Afiliação: 	LIDIANY S. ARAGÃO, UFMT-SINOP; HUGO F. ASSIS, UFMT-CUIABA; JOSIANA CAVALLI, UFMT-CUIABA; CÁTIA R. M. TESK, UFMT-CUIABA; PERIVALDO CARVALHO, UFMT-CUIABA; DALTON H. PEREIRA, UFMT-SINOP; ROBERTO J. S. JUNIOR, UFMT-CUIABA; BRUNO CARNEIRO E PEDREIRA, CPAMT.	
Título: 	Leaf photosynthesis and water use efficiency by Panicum maximum BRS Quênia.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 54., 2017, Foz do Iguaçu. A new view of animal science: challenges and perspectives: Proceedings. Foz do Iguaçu: SBZ, 2017. p. 654.	
ISSN: 	1983-4357	
Idioma: 	Inglês	
Conteúdo: 	Tropical grasses has an important role at forage-based cattle production systems. To guarantee production is necessary understand factors that allow plant growth, as well as photosynthesis. Under grazing, the amount of residual leaf area in post-grazing or plant organic reserves also driven the growth. Thus, gaseous exchange responses in forages are essential for understand forage production process, aiming maximum biological efficiency. The objective with this study was to evaluate foliar photosynthesis and water use efficiency in Quênia (Panicum maximum BRS Quênia). The pastures were submitted to intermittent grazing (95% of light interception) with two grazing intensities defined by post-grazing height: high and low (20 and 35 cm). The experiment was carried out at Embrapa Agrossilvipastoril, Sinop/MT, from March/15 to Feb/16, follow a randomized complete block design, with tree replications. Data was analyzed using the method of mixed templates, with special structure in the parametric covariance matrix, through the MIXED procedure of SAS statistical software. To choose covariance matrix, the Akaike information was used. Three seasons are evaluated (autumn, spring and summer), using three leaves (younger fully expanded per tiller) per plot, immediately before grazing. Measurements were performed using the portable infrared gas exchange analyzer (LCi-SD, ADC BioScientific Ltd., Hoddesdon, England). The light intensity was kept constant at 2000 &#956;mol photons m-2 s-1, and readings were taken between 08:30 and 11:00 AM. There is no grazing intensity effect (P>0.05) on leaf photosynthesis (27.76 &#956;mol CO2 m-2 s-1) and water use efficiency (5.65 &#956;mol CO2 mol H2O m-2 s-1). Leaf photosynthesis rate and water use efficiency showed grazing intensity x seasons interaction (P=0.0317 and P=0.0215, respectively). Despite managed under high or low grazing intensity, grass physiological responses was strongly influenced by climatic conditions, mainly due variations in water availability that occurred during experimental period. The highest values of leaf photosynthesis (34.09 &#956;mol CO2 m-2 s-1) and water use efficiency (4.13 &#956;mol CO2 mol H2O m-2 s-1) were registered in spring, season with greater values of radiation and precipitation. After mid-December, rainfall was enough to guarantee water deficit absence. Quênia guineagrass under intermittent grazing, using 95% of light interception, can have the post-graze define between 35 and 20 cm of height.	
Palavras-Chave: 	Light interception; Tropical grass.	
Thesaurus Nal: 	Grazing intensity; Grazing management.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/171656/1/2017-cpamt-bruno-pedreira-photosynthesis-water-efficiency-pancum-brs-quenia.pdf	
Registro original: 	Embrapa Agrossilvipastoril (CPAMT)	
Exemplares: 	CPAMT - (909-1) - UPC - RA - DD -  -  -  - DIS