Abstract:
The purpose of this study
was to identify the optimum levels of
gibberellic acid and suitable row ratio for
maximization the seed yield of hybrid rice.
An experiment was conducted at the
experimental farm of Rice Research and
Training Center, Egypt, during 2013 and
2014 growing seasons. The material under
this study included the parental lines of
IR69625A (Female lines) and Giza 179 R
(Restorer line) to produce F0 hybrid seeds.
A split-plot design with three replications
was used. The main plot was row ratio
(2R:8A, 2R:10A and 2R:12A) and sub plots
was the doses of gibberellic acid (g/ha)
(control, 300, 350, 400). The results
indicated that, Application of GA3 and row
ratio had significant effect on different traits
of seed yield and hybrid seed production.
The highest values of flag leaf area, panicle
length, seed set, panicle weight, panicle
exsertion and seed yield were acheived by
using 2R: 8A row ratio and was observed
the lowest values were obtained at the 2:12
row ratio. Acoording to gibberellic acid
application, the highest values for panicle
length (cm), seed set (%), panicle weight
(g), panicle exertion (%), harvest index and
seed yield were recorded by using 400 g /ha
gibberellic acid. Accordingly, the highest
net economic return from seed yield was
obtained with the treatment combination of
400 g/ha GA3 x 2:8 (R: A) row ratio.
