الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 86 |  |  |
| | | from | 86 | | |
Abstract
The present investigation was carried out in faculty of Agriculture
experimental farm, Ain Shams University, Shoubra EI-Khaima-Kaliobia Governorate during the period from 1997 to 1999 to study the effect of vernalization, gibberellic acid (GA3) and root weight on sugar beet flower induction and seed setting under Egyptian conditions and to evaluate the produced seeds as compared with its mother variety H-Poly1. The obtained results showed that only roots which exposed to low temperature (vernalization) successfully produced seeds in both experimental seasons while unvernalized roots failed to produce flower. Both flowering and seed setting percentages were increased with prolonging photo-period in both seasons up to 18h/d. Big vernalized stickling weight (>1000 g) exposed to the longest selected photo-period (18h/d) gave the highest values of flowering plants percentage (86.3% and 91.7%) and total seed yield (260.8 kg /fed and 289.36 kg/fed)) in both seasons respectively, and seed setting (100%) in the second season only. Spraying sugar beet plants with 1000 ppm GA 3 gave the
lowest mean no. of days from replanting to flowering (47.77 and 44.08
days), the highest flowering plants percentage (29.18% and 29.70%) and seed setting percentage (28.02% and 29.47%) in both experimental seasons, respectively. The highest seed setting percentage was obtained from vernalized roots of more than 1OOOg and received 1OOOppm GA 3 in both seasons (64.7 and 62.2%, resp.).The produced seeds were collected from each treatment and were subjected to an evaluation study. Results showed that the highest germination percentage (87.50%) was
obtained from seed produced on vernalized roots of 500-1OOOg and exposed to 14h/d photoperiod as compared by mother variety seed.
Concerning 100 seed weight non of the treatments studied exceeded mother variety seeds which gave 100 seed weight of 3.4 g. The highest root yield (24.5 t/fed) was obtained from seeds produced from vernalized roots of less than 500 g and exposed to 14 h/d photoperiod as compared by mother variety root yield which was 20.9 tlfed. Non of the treatments
exceeded mother variety sucrose percentage (16.5). Control treatment (0
ppm)GA3
’
faile
d to produce any viable seeds while the other two GA3
application treatments gave viable seeds and had significant effects on all seed evaluation characters. The highest value of germination percentage (71.5%) was obtained when vernalized roots of more than
. 1000g and exposed to 1000 ppm GA3 application were planted...