Data/hora: 21/09/2024 12:12:16

Biblioteca(s): 	Embrapa Arroz e Feijão; Embrapa Soja.	
Data corrente: 	26/02/2014	
Data da última atualização: 	04/06/2014	
Autoria: 	FAGERIA, N. K.; MOREIRA, A.; MORAES, L. A. C.; MORAES, M. F.	
Afiliação: 	NAND KUMAR FAGERIA, CNPAF; ADONIS MOREIRA, CNPSO; LARISSA ALEXANDRA CARDOSO MORAES, CNPSO; M. F. MORAES.	
Título: 	Nitrogen uptake and use efficiency in upland rice under two nitrogen sources.	
Ano de publicação: 	2014	
Fonte/Imprenta: 	Communications in Soil Science and Plant Analysis, New York, v. 45, n. 4, p. 461-469, 2014.	
ISSN: 	0010-3624	
DOI: 	10.1080/00103624.2013.861907	
Idioma: 	Inglês	
Conteúdo: 	Upland rice is an important crop in South America, including Brazil. Nitrogen (N) is one of the most yield-limiting nutrients in upland rice production in Brazil. A greenhouse experiment was conducted to evaluate N uptake and use efficiency as influenced by N sources. The soil used in the experiment was an Oxisol. The N sources were ammonium sulfate and urea, and N rates were 0, 50, 100, 150, 300, and 400 mg kg&#8722;1 of soil. Nitrogen concentrations in the root, shoot, and grain were significantly influenced by N sources. The N rate and N source significantly influenced the N uptake in root, shoot, and grain. Similarly, nitrogen rate by N source interaction was also significant for N uptake in the root, shoot, and grain, indicating N source has a significant influence on uptake of N. Overall, concentration (content per unit dry weight) of N was greater in the grain, followed by root and shoot. Agronomical efficiency, apparent recovery efficiency, and utilization efficiency of N were significantly influenced by N rate and varied with N sources. However, physiological and agrophysiological efficiencies were only influenced significantly by N sources. Overall, N recovery efficiency was 33% for ammonium sulfate and 37% for urea. Hence, the large amount of N lost from soil?plant system may be by denitrification or voltilization.	
Thesagro: 	Arroz; Microelemento; Nitrogênio; Nutriente; Oryza sativa; Solo.	
Thesaurus Nal: 	Nutrient use efficiency; Rice.	
Categoria do assunto: 	--
P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (32526-1) - UPC - AP - DD - 2014.027 -  - 2014.027 - DIS
CNPSO - (35079-1) - UPC - AP - DD -  -  -  - DIS