Data/hora: 15/06/2024 17:57:00

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:

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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