Data/hora: 07/06/2024 22:36:11

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	09/11/1992	
Data da última atualização: 	09/04/2010	
Autoria: 	ELAMIN, O. M.; WILCOX, G. E.	
Título: 	Nitrogen form ratio influence on muskmelon growth, composition, and manganese toxicity.	
Ano de publicação: 	1986	
Fonte/Imprenta: 	Journal American Society Horticultural Science, v. 111, n. 3, p. 320-322, 1986.	
Idioma: 	Inglês	
Conteúdo: 	Muskmelon (Cucumis melo L.) "Harvest Queen" was  grown in sand culture to investigate the effects of NH4:NO3 ratios on melon growth and elemental composition. Plants grown at NH4:NO3 ratios of 98:14, 84:28, and 56:56 developed NH4 toxicity symptoms, whereas plants grown with 20 ppm Mn and NH4:NO3 ratios of 0:112, 14:98, 28:84, and 56:56 developed Mn toxicity symptoms. Increasing the proportion of NH4 in nutrient solution up to 1:1 with NO3 decreased Mn concentrations in plant tissues and alleviated Mn toxicity symptoms, whereas at NH4:NO3 ratios of 84:28 and  98:14 uptake of Mn was inhibited and never reached a concentration in the tissue that developed toxicity symptoms. Shoot and root growth was greatest when grown at the 14:98 NH4:NO3 ratio. Increasing NH4 in the solution beyond 14 ppm in the 112-ppm N mixture resulted in increasing limitation of growth. Increasing Mn concentration in the nutrient solution to 20 ppm restricted  growth at NH4:NO3 ratios menor ou igual a 1. However, Mn treatment did not influence the growth of plants grown at NH4:NO3 ratios maior que 1 at 84:28 and 98:14.	
Palavras-Chave: 	Composição; Nutrição de planta.	
Thesagro: 	Crescimento; Fisiologia Vegetal; Melão; Nitrogênio.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (2856-1) - ADD - SP - PP - SP 5001/1993 -  - SP5001/93 - DIS