Fifty-one lines from Embrapa Rice & Beans Germplasm Bank were evaluated under conditions of low and high soil phosphorus (P) content, in order to identify P use efficiency indicators as well as lines with differentiated response to P use efficiency. Phosphorus use efficiency index was more suitable to evaluate lines in relation to P use efficiency than grain yield at low soil P content. Three lines, CNA 4634, CNA 4120, and CNA 3178 showed good grain yield performance at high as well as at low soil P content, while 22 lines showed good grain yield performance at high soil P content, but were not efficient in the use of low available soil P, while the rest were not considered because they showed low yield performance at high soil P content.
Oryza sativa L.; phosphorus use efficiency index; P-efficient and non-efficient cultivars
