Data/hora: 08/06/2024 02:32:04

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	24/09/1992	
Data da última atualização: 	29/10/2004	
Autoria: 	UNGARO, M. R. G.; NOGUEIRA, S. S.; ARRUDA, M. B.	
Afiliação: 	Instituto Agronomico do Estado de Sao Paulo, P.O.Box 28, Campinas, SP. Brazil.	
Título: 	Growth analysis of sunflower.	
Ano de publicação: 	1985	
Fonte/Imprenta: 	In: CONFERENCIA INTERNACIONAL DE GIRASOL, 11., 1985, Mar del Plata. Actas. Mar del Plata: ASAGIR/ISA, 1985. t.1, p.61-66.	
Idioma: 	Inglês	
Conteúdo: 	A growth analysis study on the effects of two contrasting environments on the yield of field grown sunflower (Helianthus annuus L.) cultivated in Campinas, Sao Paulo State, Brazil, was undertaken. Accumulation of dry matter, NAR, RGR, LAI, LAD, LAR were determined in two diferent seasons of cultivation, in a randomized experimental design with 5 replications. Higher values for those parameters were obtained in the wet season. Althoug total seed weight in the wet season was higher, the difference between seed yield of wet and dry season was only about 400 kg/ha probably due to the excess of rain and cloudy days during flowering period in the wet season, leading to an increase of empty seeds and decrease in photosynthetic level. The plant grown in the dry seasonwas much more efficient because it allocated less for growing, concentrating the efforts in seed yield. The earlier leaf senescence observed in the dry season was responsible for the greater decrease in NAR. Both LAI and LAD give higher values in the wet season, at flowering. Regression analysis showed good fit to all parameters studied, except for NAR in the dry season.	
Palavras-Chave: 	Brasil; Growth; Sao Paulo; Sunflower.	
Thesagro: 	Crescimento; Fisiologia; Floração; Girassol.	
Thesaurus Nal: 	Brazil; flowering; physiology.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)