Table 7: Iron plant-analysis interpretations for common Guinea Savannah crops [34].

CropDeficientLowSufficientHigh

Soybeans<30 ppm30–50 ppm51–350 ppm>350 ppm
Maize<10 ppm10–50 ppm51–250 ppm>250 ppm
Potato<11 ppm11–300 ppm>300 ppm
Groundnut<10 ppm10–50 ppm51–250 ppm>250 ppm
Cassava<20 ppm20–30 ppm31–250 ppm>250 ppm