Please use this identifier to cite or link to this item:
|Title:||Response of rice cultivars to phosphorus supply on an oxisol.|
|Authors:||FAGERIA, N. K.|
MORAIS, O. P.
BALIGAR, V. C.
WRIGHT, R. J.
|Affiliation:||NAND KUMAR FAGERIA, CNPAF; ORLANDO PEIXOTO DE MORAIS, CNPAF.|
|Citation:||Fertilizer Research, v. 16, n. 3, p. 195-206, July 1988.|
|Description:||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.|
|Type of Material:||Artigo de periódico|
|Appears in Collections:||Artigo em periódico indexado (CNPAF)|