
O objetivo do trabalho foi comparar o desempenho de cultivares e linhagens experimentais de arroz de terras altas, sob plantios direto e convencional, bem como verificar se há resposta diferenciada dos materiais testados aos dois sistemas de cultivo. Para tanto, foram conduzidos, em Lambari-MG, dois ensaios, um no sistema plantio direto e outro no sistema convencional, repetidos nos anos agrícolas 2003/2004 e 2004/2005. Foram testadas treze cultivares/linhagens experimentais de arroz de terras altas. Utilizou-se o delineamento experimental de blocos ao acaso, com três repetições. As variáveis analisadas foram: produtividade de grãos, altura da planta, floração e incidência de doenças. Os genótipos avaliados tiveram comportamentos semelhantes para produtividade de grãos nos dois sistemas de cultivo. No sistema plantio direto houve uma tendência de redução na altura das plantas, comparativamente ao sistema convencional. Concluiu-se que o sistema plantio direto constitui alternativa viável para a cultura do arroz de terras altas. PALAVRAS-CHAVE: Oryza sativa; melhoramento genético; sistema de plantio.
This study aimed to compare the performance of upland rice cultivars and experimental lines under no-tillage and conventional planting system, as well as to verify if there was differentiated responses from tested genotypes in the two tillage systems. For so much, two experiments, one under no-tillage and another under conventional tillage, were conducted at Lambari, Minas Gerais State, Brazil, repeated in the 2003/2004 and 2004/2005 growing seasons. Thirteen cultivars/experimental lines were tested. A randomized block design with three replications was used. Grain yield, plant height, flowering, and disease incidence were analyzed. Rice genotypes evaluated showed similar behavior in grain yield in the two tillage systems. In the no-tillage system, there was a tendency for reduction in plant height if compared to the conventional system. It was concluded that the no-tillage system is a feasible alternative for upland rice crop. KEY-WORDS: Oryza sativa; genetic breeding; planting system.
planting system, sistema de plantio, melhoramento genético, Oryza sativa, genetic breeding
planting system, sistema de plantio, melhoramento genético, Oryza sativa, genetic breeding
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