Data/hora: 15/06/2024 07:15:05

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	26/11/1992	
Data da última atualização: 	29/10/2004	
Autoria: 	SFREDO, G. J; SARRUGE, J. R.; CAMPO, R. J.	
Afiliação: 	EMBRAPA-CNPSo. Londrina, PR.	
Título: 	Dry matter production and macronutrients concentration in two cultivars of sunflower (Helianthus annuus L.) under field conditions.	
Ano de publicação: 	1985	
Fonte/Imprenta: 	In: CONFERENCIA INTERNACIONAL DE GIRASOL, 11., 1985, Mar del Plata. Actas... Mar del Plata: ASAGIR/ISA, 1985.	
Volume: 	t.1	
Páginas: 	p.183-188.	
Idioma: 	Inglês	
Conteúdo: 	In order to study the dry matter production and macronutrients concentration in different plant parts during the growth of sunflower plants, a field experiment was carried out at the Centro Nacional de Pesquisa de Soja/EMBRAPA, Londrina, PR, Brazil. The plants were grown in a Latossol Roxo eutrofico (Eutrustox). Six fertilizer levels were used: 0-0-0; 1-1-1; 2-1-1; 1-2-1; 2-0-0; (NPK), being 0 = 0; 1 = 45 kg/ha; 2 = 90 kg/ha (N1P205, K2O), with four replications. For the achenes and receptacles the maximum accumulation occurs at 90 days after emergence. The authors concluded: the highest rate of growth occurred at 56 days and the maximum dry matter production at 75 days after the emergence for leaves and stems. Among these treatments was chosen the one which  gave the highest yield (level 0-0-0) for study the dry matter accumulation and the macronutrients concentration. The lowest concentration of the nutrients occurred near the period of maximum dry matter production (80 days). For foliar diagnosis the following levels may be used: N = 3.30%; P = 0.39%; K = 3.16%; Ca = 2.73%; Mg = 0.59%, and S = 0.16%.	
Palavras-Chave: 	Brasil; Cultivar; Dry matter; Macronutrient; Macronutriente; Parana; Sunflower; Variety.	
Thesagro: 	Girassol; Helianthus Annuus; Matéria Seca.	
Thesaurus Nal: 	Brazil.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)