Evaluation of sink and source relationships on grain yield and its components of sunflower ( Helianthus annuus L. )

Subject Areas : crop production

زينب محمدزاده اصل ¹ , عليرضا عيوضي ²

1 - دانش آموخته كارشناسي ارشد، گروه كشاورزي – زراعت، دانشگاه پيام نور البرز، كرج – ايران.
2 - استاديار پژوهشي بخش تحقيقات نهال و بذر، مركز تحقيقات و آموزش كشاورزي و منابع طبيعي استان آذربايجانغربي، سازمان تحقيقات، آموزش و ترويج كشاورزي، اروميه – ايران

Received: 2017-10-04 Accepted : 2018-04-10 Published : 2018-05-31

Keywords: defoliation , grain removing , grain yield and its component , sunflower,

Abstract :

To investigate the effects of different levels of leaf and grain removing on grain yield and its components in sunflower, an experiment was carried out in Saatloo agricultural research station of Urmia. A factorial experiment was done based on randomized complete blocks design with four replications in 2012 growing season. The first factor consisted of four levels of defoliation including; removing 1/3 upper, removing 1/3 middle, removing 1/3 lower leaves of stem and no defoliation of control. The second factor involved grain removing with four levels; removing 1/3 of side, 1/3 of middle and 1/3 of central grains of disc flower and non grain removing as control. Results showed that non-leaf removing and removing 1/3 side grains of disc flower had the highest effect on 1000 kernel weight with 223.25g and total dry matter 2656.0g/plant. The highest amount of grain yield was 177.50g/plant in removing of 1/3 below leaves and non removing grains. In non leaf removing treatment, leaf area had significantly positive correlation with total dry matter ( r=0.99**). Also, protein grain percentage had positively significant with grain yield in non grain removing of disc flower ( r=0.96*).Regression analysis showed that traits of leaf area and disc flower diameter in leaf removing treatment and only disc flower diameter in grain removing treatment had the greatest effects on grain yield.

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