%0 Journal Article
%T Response of rice cultivars to nitrogen in upland conditions Resposta de cultivares de arroz ao nitrog那nio em condi  es de terras altas
%A F芍bio Luiz Checchio Mingotte
%A Renata Kimie Hanashiro
%A Domingos Fornasieri Filho
%J Revista Ceres
%D 2013
%I Universidade Federal De Vi?osa
%X Against the background of a growing world population, rice (Oryza sativa L.) consumption is expected to grow faster than its production. Therefore, an appropriate question would be: how to increase productivity in the short-term? In this respect, it becomes important the implementation of modern agricultural production systems, such as upland rice with supplemental sprinkler irrigation. Additional information is needed to maximize the available resources, with special attention given to research on the use of nitrogen. This study aimed to evaluate the agronomic performance of commercial rice cultivars with different plant characteristics in upland conditions with supplemental sprinkler irrigation, when subjected to nitrogen in topdress application at the R1 stage (panicle differentiation). The experiment was arranged in a randomized block with split plot design, with 65 treatments, consisting of the combination of 13 cultivars in the plots, and five nitrogen levels in the subplots (0, 40, 80, 120 and 160 kg ha-1), with four replications. Genetic variability was detected among rice cultivars and the agronomic performance in response to the applied nitrogen. The topdressing application of nitrogen increases, in general, the production components and grain yield in rice. Cultivars BRS Primavera, Caiap車 and IAC 202 stood out for grain yield, followed by Baldo, Carnaroli, BRS Curinga and IAC 500 with lower yields. No cen芍rio crescente da popula  o mundial, a cultura do arroz (Oryza sativa L.) apresenta proje  es de consumo superiores 角s da sua produ  o. Um questionamento oportuno seria: em curto prazo como aumentar a produtividade? Neste aspecto, torna-se importante a implanta  o de modernos sistemas agr赤colas de produ  o, a exemplo do arroz em terras altas, sob condi  es de irriga  o suplementar por aspers o. Informa  es adicionais s o necess芍rias para maximizar os recursos dispon赤veis, destacando-se as pesquisas que se relacionam com o uso do nitrog那nio. Este trabalho teve por objetivo avaliar o comportamento agron mico de cultivares comerciais de arroz, com caracter赤sticas distintas de planta, em condi  es de terras altas, sob irriga  o suplementar por aspers o, quando submetidas a doses de nitrog那nio aplicadas em cobertura, no est芍dio R1 (diferencia  o da pan赤cula). O delineamento estat赤stico foi o de blocos casualizados, com parcelas subdivididas, com 65 tratamentos, constitu赤dos pela combina  o de 13 cultivares nas parcelas, e cinco doses de nitrog那nio nas subparcelas (0, 40, 80, 120 e 160 kg ha-1), com quatro repeti  es. Observou-se a exist那ncia de va
%K Oryza sativa L.
%K doses de nitrog那nio
%K irriga  o por aspers o
%K componentes de rendimento
%K produ  o de gr os
%K Oryza sativa L.
%K nitrogen rates
%K sprinkler irrigation
%K yield components
%K grain yield
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-737X2013000100013