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Abstract this investigation was carried out during the 2007 and 2008 summer seasons at Shandaweel Agric. Research Station, Sohag governorate to study the effect of two growth regulators i.e. Indol acetic acid (IAA) and Gibberellic aced (GA) and its three application methods (soaking, spraying and both of them) under two nitrogen levels (50 and 100 kg N./fed.) on commercial grain sorghum cultivars (Dorado variety and Shandaweel-1 hybrid). Sowing dates were on 21st and 18th June in 2007 and 2008, respectively. Two experiments were conducted in each season, the first one assigned to Dorado variety and the second to Shandaweel- 1hybrid in 2007 season and it is repeated in 2008 season. Each experiment consists of 72 plots. Each plot included 6 ridges, 6 m. long and 60 cm. apart (plot area: 6 x 6 x 0.6 = 21.6 m.2) for Shandaweel-1 and Dorado cultivars. Sowing had done in hills spaced 15 cm. and two plants/hill were left three weeks from sowing at both seasons. Each experiment was designed in split-split plot design with four replications. Nitrogen levels were located in the main plots while the types of growth regulators and application methods were distributed to sub and sub sub plots, respectively. |