Tillage and fertilizer effects on some soil properties, leaf nutrient concentrations, growth and sweet potato yield on an Alfisol in southwestern Nigeria

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Tillage practices affect biomass and grain yield through regulating root growth, root-bleeding sap and nutrients uptake in summer maize (2014, background): “Conventional tillage had significantly lower soil bulk density than zero tillage and resulted in higher leaf N, P, K, Ga and Mg and tuber yield of sweet potato compared with zero tillage (Agbede, 2010).”