The Effect of Potassium ,Gibberellic Acid and their Interaction effects onthe Growth of Roselle Plant (Hibiscus sabdariffa L. )

Abstract

This study was conducted at Al-Bargah district (30)Km north east Kerbala city during the period from 2nd ,March till 12th ,October ,2012.The aim was to assess the effect of three levels of Potassium (i.e.0.5 ,1.0 and 2.0)g/pot, four concentrations of Gibberellic acid( i.e. 0 ,50,100and 150) mg/L and their interaction on growth parameters of roselle plant(Hibiscus sabdariffa L.).The treatments were applied twice,at 4-6 true leaf stage and at the flowering stage.Results could summarized as follow.1-Increasing potassium levels significantly increasedplants height ,no. of branches ,leaves number andarea and fresh and dry weights of shoot.2- Results revealed that , 50 mg/L GA3 caused an increment inplants height ,no. of branches ,leaves number andarea and fresh and dry weights of shoot.3-The interaction between K and GA3 revealed that , the treatment of 2.0 g K and 50 mg/L GA3 increasedno. of branches and leaves area and fresh and dry weights of shoot.While,plantsheight andno. of leaves were notaffected.