الفهرس 
Seedling agesOnly 14 pages are availabe for public view
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Abstract
A study was done in bilateral co-operation between the Agronomy Department,Faculty of Agriculture Tanta University and the Rice Research and Training Center,Sakha,ARC Two field experiments were carried out at the experimental farm of Sakha Agricultural Research Station, Kafr El–Sheikh Governorate,Egypt,during the two successive summer seasons of 2009 and 2010.The field experiments were conducted to study the effect of seedling ages,row ratios and(GA3)application on growth characters,yield and its components of hybrid rice seed production and seedling traits of hybrid seeds.The material under this study included the parental lines of K17A(female lines) and IR195 R (restorer line) to produce F1 hybrid seeds.A split split-plot design with three replications was used.The main plot devoted to seedling age while row ratio arranged in the sub- plots and the doses of GA3, was assigned in the sub-sub plots. Four doses of GA3(BERLEX) were,300,350,400,g/ha and a control used for spraying with water in two sprayings.