Sunflower genotype performance in different spacing in the northeast for Rio Grande do Sul

Abstract

The sunflower productivity development is conditionate to the harvest period, density, seeding spacing, genotype, soul fertility and hydric availability. This work evaluated the adaptability and stability of 14 sunflower genotypes in the Northwest region of RS, in different row spacing. The experiment was carried in Frederico Westphalen, in the 2019/2020 harvest, with a randomized block design in a 14x2 two-factor scheme, with 14 cultivars and two spacing. Plants were sampled between the useful samples for its evaluations of: Plant height; Chapter diameter; Stem diameter; Thousand weight seeds; Grain production. The spacing of 0.90 meters provided greater chapter size. When analyzed the cultivars production between spacing, is noticeable that for spacing of 0.45 meters, cultivar 1 differed from the others, obtaining the highest productivity 1.93 ton.ha-1, and cultivar 7 the lowest productivity 0 .64 ton.ha-1, a reduction of 66.8%. The variable PMS presented better results in the spacing of 0.90 meters. Cultivar 9 showed the highest values in both spacing. The spacing between rows did not influence the variables of plant height and stem diameter for the different sunflower cultivars.