This work was developed during the agricultural years 2003/04 and 2004/05, in the experimental area of the São Paulo State University (Unesp - FCAV), in Jaboticabal (SP). The objective of this work was to evaluate the influence of different N rates in side dressing (0, 30, 60, 90 and 120 kg ha-1) on agronomic characteristics of different cultivars of upland rice (Caiapó, Primavera, Confiança, IAC 202 and Carisma), with sprinkler-irrigation. The cultivars Caiapó, IAC 202 and Carisma showed the highest yields, while Primavera did not respond to the increase in nitrogen fertilization; IAC 202 and Carisma had the highest harvest rates and were responsive to side-dressed nitrogen application and can be indicated for more advanced production systems; cultivatr Caiapó was shown to be more efficient in absorbing and using the N in the soil and can be indicated for production systems with lower technology input.
Agronomic efficiency; Oryza sativa L; yield components
