Yield Contributing Parameters of Autumn Planted Sunflower (Helianthus annuus L.) Hybrids under Semiarid Conditions

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Razzaq, M. K. (2017). Yield Contributing Parameters of Autumn Planted Sunflower (Helianthus annuus L.) Hybrids under Semiarid Conditions. Academy of Agriculture Journal, 2(08). https://doi.org/10.15520/aaj.v2i08.48
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Abstract

This research was conducted to assess the indirect selection of yield through yield contributing traits because seed yield possess complex inheritance and low heritability. In this study fifteen hybrids of sunflower (Helianthus annuus L.) were evaluated in autumn 2016; RCB design in triplicate by maintaining row to row and plant to plant distance of 75 cm and 9 cm respectively, for days to 50% flowering, head diameter, seed weight head-1, 100 seed weight, oil contents, multithreads, leaves plant-1, stem thickness at base and at angle of curvature, endosperm and testa weight of 100 seeds. Relationship between these traits and their direct and indirect effect on seed yield were assessed. These computed correlations among number of leaves plant-1, stem thickness at base, 100 seed weight, seed weight head-1, endosperm and testa weight of 100 seeds had highly significant positive relationship with seed yield. However, multiheads had weak negative relationship and oil contents had no relationship with seed yield. Path analysis indicated direct effects with number of leaves plant-1, stem thickness at base, seed weight head-1, endosperm weight of 100 seeds and 100 seed weight were positive, although direct effects of head diameter, stem thickness at angle of curvature and testa weight of 100 seeds were negative on seed yield. It is concluded from the contemporary research that selection based on traits; 100 seed weight, seed weight per head, number of leaves plant-1, stem thickness at base, endosperm and testa weight of 100 seeds is most effective for yield improvement under semiarid conditions. 

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