“Planting Density Modulates Growth and Biomass Allocation of Cowpea (Vigna Unguiculata [L.] Walp) in Iron Industry Effluent-Contaminated Soil: Planting Density and Cowpea Growth under Effluent Contamination” (2026) Journal of Science and Technology, pp. 121–133. doi:10.4314/w7hps817.