Table 1.

Summary of plant micronutrient concentrations data obtained from different sources in sub-Saharan Africa, for the crops, maize (Zea mays L.), wheat (Triticum aestivum L.), rice (Oryza sativa L.), cowpea (Vigna unguiculata L.), pearl millet (Pennisetum glaucum), finger millet (Eleusine coracana Gaertn.) and sorghum (Sorghum bicolor L.)

Country	Crops	Crop parts	Micronutrients	Count	Data sources
Benin	Maize	Leaves	Zn	100	Diagnostic trials
Ethiopia	Wheat	Grain	S	24	Habtegebriel and Singh (2009)
Ghana	Cowpea, maize	Shoots	Zn	84	Wortmann et al. (2019a, b)
Kenya	Maize	Leaves	Zn	1014	AFSIS
Malawi	Cowpea, maize	Grain, leaves	Zn, Se, Cu, Mn, S,	2570	Chilimba et al. (2012/2014), Wortmann et al. (2019a, b), AFSIS
Mali	Maize, pearl millet	Shoots	Zn	333	Wortmann et al. (2019a, b)
Niger	Cowpea, maize, pearl millet, sorghum	Shoots	Zn	1232	Wortmann et al. (2019a, b)
Nigeria	Maize, sorghum	Shoots, leaves	Zn, Mn, S, B	6246	AFSIS, TAMASA, Nziguheba et al. (2009), Wortmann et al. (2019a, b)
Rwanda	Maize, sorghum	Shoots	Zn	28	Wortmann et al. (2019a, b)
Tanzania	Cowpea, maize, sorghum	Grains, shoots	Zn, Cu	394	Wortmann et al. (2019a, b), Lisuma et al. (2006)
Togo	Maize	Leaves	Zn, Mn, S, B	1115	Diagnostic trials
Uganda	Finger millet	Shoots	Zn	665	Wortmann et al. (2019a, b)
Zambia	Maize, wheat	Grains, shoots	Zn	117	Zou et al. (2012); Ram et al. (2015), Wortmann et al. (2019a, b)
Zimbabwe	Cowpea, finger millet, maize, sorghum	Grain	Zn	706	Manzeke et al. (2019)

AfSIS = Africa Soil Information Service; TAMASA = Taking Maize Agronomy to Scale in Africa