Effects of Stand Reduction Applied at Different Plant Growth Stages on the Yield and Yield Components of Components of Sunflower

Authors : Abdurrahim Tanju GÖKSOY

Pages : 329-336

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Publication Date : 1999-06-01

Article Type : Research Paper

Abstract :The aim of this tudy was to determined the effects of stand loss applied at different growth stages on the yield and yield components of sunflower. The research was conducted during two-years insert ignore into journalissuearticles values(1994-1995); under dry conditions in Bursa. In this tudy, plant populations were reduced to 25 % and 50 % compared to check insert ignore into journalissuearticles values( 60.000 pants/ha); at the 4-, 8-, 16- leaf and bud stages of sunflower. According to the results, no significant reduictions in seed yield occurred when plant populations were reduced by 25 % insert ignore into journalissuearticles values(45.000 plants/ha); compared to check. However, it was determined that significant reductions in seed yield obtained when stands were reduced 50 % insert ignore into journalissuearticles values(30.000 plants/ha); from the check. 22 %, 17 %, 29 % and 33 % yield loss occurred when populations were reduced 50 % at the 4-, 8-, 16 leaf and bud stages, respectively. Especially, stand reduction of 50 % at later growth stages insert ignore into journalissuearticles values(16- leaf and bud stages); resulted in significant yield loss. Significant yield losses were arisen with decrease at head diameter and seeds per head. This observation is substantiated by the high correlations between of both head diameter and seeds per head with yield within 30.000 plants/ha insert ignore into journalissuearticles values(50 % stand loss); treatments. Because, positive correlations were noted between head diameter and seeds per head with yield at the lowest plant population.
Keywords : Turk J Agric For, 23, 1999, , 329 336 Turk J Agric For, vol 23, iss 3