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Lack of cereal nutritional water productivity (NWP) information disadvantages linkages of nutrition to water-food nexus as staple food crops in Sub-Saharan Africa (SSA). This study determined the suitability of sorghum ( Sorghum bicolor L. Moench) genotypes to alleviate protein, Zn and Fe deficiency under water-scarce dryland conditions through evaluation of NWP. Sorghum genotypes (Macia, Ujiba, PAN8816, IsiZulu) NWP was quantified from three planting seasons for various sorghum seed nutrients under dryland semi-arid conditions. Seasons by genotypes interaction highly and significantly affected NWP Starch, Ca, Cu, Fe , and significantly affected NWP Mg, K, Na, P, Zn . Genotypic variations highly and significantly affected sorghum NWP Protein, Mn . Macia exhibited statistically superior NWP protein (13.2-14.6 kg·m -3 ) and NWP Zn (2.0-2.6 g·m -3 ) compared to other tested genotypes, while Macia NWP Fe (2.6-2.7 g·m -3 ) was considerably inferior to that of Ujiba and IsiZulu landraces under increased water scarcity. Excellent overall NWP protein, Fe and Zn under water scarcity make Macia a well-rounded genotype suitable to alleviating food and nutritional insecurity challenges in semi-arid SSA; however, landraces are viable alternatives with limited NWP protein and Zn penalty under water-limited conditions. These results underline genotype selection as a vital tool in improving "nutrition per drop" in semi-arid regions.

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Assessing Suitability of Sorghum to Alleviate Sub-Saharan Nutritional Deficiencies through the Nutritional Water Productivity Index in Semi-Arid Regions