Agronomic traits and their correlations in sunflower hybrids adapted to second crop

Abstract

The objective of this work was to evaluate the agronomic traits of sunflower hybrids adapted to second crop and to determine the correlations between them. Fifteen hybrids were tested – two high-oleic and 13 non high-oleic ones (traditional hybrids) –, besides one hybrid used as a check. A randomized complete block experimental design was carried out with four replicates, and sowings were done in 2013 and 2014. The evaluated traits were the following: days to physiological maturity, plant height, grain yield, oil content, and oil yield. The higher grain yields occurred in hybrids that are neither of early cycles nor of shorter stems. The correlation between grain yield and oil yield was positive and significant; however, the correlations between oil content and these two traits were not significant. The 'Syn 045' and 'Syn 3950A' sunflower hybrids (high-oleic) stood out, in the second season, both for grain yield and oil yield. The 'CF 101' hybrid – early cycle – shows good grain and oil yield, and, therefore, it is an appropriate option for late sowing in the second season. Thus, adapted sunflower hybrids with appropriate traits are available for second season cropping and to meet market demands.