عنوان مقاله [English]
A factorial experiment based on completely randomized design was carried out to study the effect of Gibberellic acid on morphological qualities of hybrid rice parental lines in spring 2006. The study was done in a three hectares field in Amol. In this investigation, the male sterile line, IR58025A, accompanied by the male sterile line restoring, IR58025B, were planted in the proportion of 6:2 and 8:2. At blossom, flag leaf cut and GA3 hormone spraying with different viscosities were used as treatments. The results of variance analysis showed significant differences among different plots, and the two A and B parents. Comparison of means showed that flag leaf cut had a significant effect on the height of bushes and an important role in seed filling. Also with regards to seed filling, 150gm hormone per hectare was significantly more influential than 60 gm. This result proved the role of higher doses of hormone in seed filling. No differences were observed between planting proportions of 6:2 and 8:2.