Abstract
Nitrogen is an essential element for rice crop development. Once this cereal is taken as the base for food security, employment generation and source of income for most countries, we aimed to evaluate upland rice genotypes development submitted to nitrogen stress in southern Cerrado of Tocantins State. Field experiments were carried out at Chaparral Farm and at the Experimental unit of Federal University of Tocantins in the growing seasons of 2008/2009, 2009/2010, 2010/2011, 2011/2012 and 2012/2013. Experimental design consisted of randomized blocks in factorial scheme 3 x 5, consisting of three genotypes in five years with four replications. It was concluded that growing season 2012/13 provided the highest grain yield; the hydric stress, as well as nitrogen stress, reduced significantly yield enhancement and; cultivar BRS-Bonanca presented the highest grain yield average.
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