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Evaluation of yields, pests and soil nutrients in sorghum-groundnut cropping system in Western Bahr El Ghazal, Warrap and Abyei, South Sudan

Research Paper | September 1, 2018

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Makur J. Achuoth

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Int. J. Agron. Agri. Res.13( 3), 21-36, September 2018


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The study was carried out in Western Bahr el Ghazal, Warrap and Abyei in South Sudan from September to November 2014 and September to November 2015.  Objectives were to identify common cropping systems, pests, diseases and weeds, their effect on sorghum and groundnut yields. The data was collected using questionnaires and direct observation in the field. Soil samples were collected from Gogrial West, Udichi, Wau, Mading-Achueng and Wunpeeth. Key parameters cluded existing cropping systems, planting methods, land preparation methods, seed types and sources, pests, diseases, weeds infestation, soil pH, organic carbon, total N, K, Na, Ca, Mg and rain yields under various cropping systems respectively. Analysis of variance was done and means separation using the least significant difference test at p≤0.05. Significant variation among sites were noted in % O.C, % N, P, K, Ca and Mg. The pH in sampled soils ranged from 6.1 to 7.2. All surveyed locations were deficient in %O.C, %N, K and Ca which ranged from 0.8 to 3.4%. 0.07 to 0.19%, 0.5 to 1.7 Cmols kg-1and 0.7 to 2.5 Cmols kg-1 respectively. Sorghum yields under sorghum and groundnut intercrop ranged from 0.65t/ha in Gogrial West to 4.1t/ha in Raga County. There was yield advantage in all surved locations except Wau with an LER of 0.98. In conclusion, cropping system, combined with biotic and abiotic factors have much influence on ultimate yields of groundnut sorghum. Existing cropping systems of sorghum-groundnut produced better yield than sorghum and groundnut crops grown as sole crops


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Evaluation of yields, pests and soil nutrients in sorghum-groundnut cropping system in Western Bahr El Ghazal, Warrap and Abyei, South Sudan

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