Performance of upland rice cultivars on cerrado soil

Resumo

The rice is a grain which belongs to the Poaceae family. It is produced in two ecosystems wich are the floodplain and the uplands. It is used as part of the daily diet of diferent populations. There is a growing demand for rice consumption around the world. That cereal has great socioeconomic importance. The State of Tocantins has a great productive potential. Therefore, the aim of the study was to evaluate the productive performance of upland rice cultivars in five years of evaluation in the cerrado of the southern state part of Tocantins. The experiments were conducted on the field at the Chaparral Farm and on the Experimental Station of the Federal University of Tocantins in the years of 2007/2008, 2008/2009, 2009/2010, 2010/2011 and 2011/2012. The experimental design was a randomized blocks with four replications in a 4 x 5 factorial scheme, consisting of four genotypes and five years. The evaluated characteristics were number of days to flowering, plant height, weight of hundred grains and grain yield. It was concluded that the 2007/08 crop year was where the cultivars presented the highest grain yields ranging from 2729 to 1716 kg ha^-1. The cultivars BRS-Bonança, BRS-Primavera and BRSMG-Conai reached the best averages of grain production on the five years of cultivation. Those cultivars can be indicated for use in the region. It is suggested that more studies have to be carry out on different planting periods for upland rice in Tocantins.