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. 2020 Jan 4;42(9):3015–3033. doi: 10.1007/s10653-019-00499-w

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© The Author(s) 2020

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Fig. 7 — Concentrations of plant zinc for different crops at different soil Zn values for OFRA study locations across sub-Sahara Africa. All the samples are derived from treatments applied with N, P and K. The crops are maize (Zea mays L.), cowpea (Vigna unguiculata L.), pearl millet (Pennisetum glaucum), finger millet (Eleusine coracana) and sorghum (Sorghum bicolor L.)