Título:	Response of rice cultivars to phosphorus supply on an oxisol.
Autoria:	FAGERIA, N. K. MORAIS, O. P. BALIGAR, V. C. WRIGHT, R. J.
Afiliação:	NAND KUMAR FAGERIA, CNPAF; ORLANDO PEIXOTO DE MORAIS, CNPAF.
Ano de publicação:	1988
Referência:	Fertilizer Research, v. 16, n. 3, p. 195-206, July 1988.
Conteúdo:	Genotypic differences in absorption or utilization of P might be exploited to improve efficiency of fertilizer use or to obtain higher productivity on P-deficient soils. The objective of this study was to evaluate responses by 75 genotypes of upland rice (Oryza sativa L.) to two soil P levels in two field experiments. In the first experiment, soil P levels (Mehlich 1) were 1.5 mg kg-1 and 5 mg kg-1, and in the second experiment, 3 mg kg-1 and 4.7 mg kg-1 of soil, respectively. Rice cultivars differed significantly in shoot dry matter production at flowering, grain yield, and plant P status. Based on a grain yield efficiency index, cultivars were classified as P-efficient or P-inefficient. Shoot dry matter was more sensitive to P-deficiency but was not related to grain yield. Phosphorus use efficiency was higher under the low P treatment. Phosphorus uptake was significantly correlated with dry matter, P concentration and P-efficiency ratio. Results of this study indicate that genetic differences in P-use efficiency exist among upland rice cultivars and may be exploited in breeding programs.
Thesagro:	Arroz Cerrado Fósforo Oryza Sativa Oxisol Solo
NAL Thesaurus:	Rice Phosphorus Oxisols
Palavras-chave:	Fertilizacao Genotypic differences
Digital Object Identifier:	https://doi.org/10.1007/BF01051370
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPAF)