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chala Gutema, “Effects of N and NPS Fertilizer on Yield Components and Seed Yield of Black Cumin (Nigella Sativa L.) at Bale, South eastern Ethiopia”, Int. J. Seed Spice., vol. 14, no. 1, pp. 47–56, Mar. 2025, doi: 10.56093/IJSS.v14i1.5.