Accepted 16th March, 2020.
These studies were conducted for two seasons (dry and rain seasons) during 2016/2017cropping season at Nyamliel Agricultural Demonstration and Learning Centre, NADLC and the University of Juba. The objectives were to identify stress tolerant/ or resistant traditional sorghum land races to both drought and high moisture conditions that are locally cultivated in Tonj South: GPS coordinates N 070 18.328'; and E 028045.533'), Nyamliel and Gog Machar (Aweil). Eight sorghum genotypes 5 from Nyamliel evaluated at (Aweil) and 3 from Tonjplus the 5 from Aweil evaluated at the University of Juba namely, Rapchol, Yar, Rapheir (Contrl-1), Malwal, Luel, Aher (Contrl-2), AdhalRwuait and Acholkol. These genotypes were evaluated under five irrigation regimes of: 2DI (two day intervals); 7DI; 10DI; 15DI and 30DI, respectively. Results showed sorghum genotypes namely, Yar, Malwal, Rapher and Aher as superior and out yielded genotypes Luel and Acholkol and the other entries at (P<0.05) under drought conditions. Conversely, under water-logged conditions the yields of all eight tested genotypes were not significantly different from each other (P<0.05). The study concluded that in the areas covered by the study namely, Aweil (Nyamliel and Gog Machar), and Tonj South within the traditional sorghum germplasm there are materials with good traits that are tolerant to both excess (high) and (low) levels of moisture stress. Furthermore, the study recommends another similar exercise to include an extended range of sorghum genotypes in this and neighboring areas so as to widen the spectrum of tolerant genotypes/ varieties to high/low moisture stresses and the introduction of exotic high yielding genotypes from similar environments as tools to build resilience and adapt to the effects of climate change and improve crop productivity thus, striving to build and maintain resilient and food secure communities in South Sudan.
Keywords: Sorghum spp.; genotypes; drought tolerance; excess moisture; irrigation regimes; South Sudan