Agronomic performance of irrigated rice hybrids on the Western border of Rio Grande do Sul

Abstract

The objective of this work was to compare the agronomic performance of three cultivars of irrigated rice, two hybrids and one conventional in the municipality of Uruguaiana, west border of Rio Grande do Sul. The experiment was conducted in the 2017/2018 harvest in a completely randomized design with four repetitions. The three treatments were the cultivar Guri Inta CL, and the hybrids Titan CL and Lexus CL. Plant morphological traits (plant length, panicle length, grain length, grain width, grain appearance) as well as yield components (weight of one thousand grains, number of grains per panicle, number of grains broken per panicle , plant population, yield of whole grains). For the variables of appearance and grain size, the statistical analyzer S-21 was used. The three varieties did not differ statistically for productivity, however they differed in other aspects such as yield of whole grains, initial population of plants and aspects of appearance and dimensions of grains, where the cultivar Guri Inta CL was superior, and the hybrids did not differ among themselves. As the hybrids had a lower initial plant population, compensated in other characters, the cultivar Titan presented a greater number of tiller than the other cultivars, while the Lexus cultivar had a higher number of spikelets per panicle, more branches per panicle and weight of thousand grains.