District

(kg∙ha⁻¹)

Fertilizer applied

Soil nutrient status

Mean maize grain yield

N

P

K

N (%)

Av. P (mg∙kg⁻¹)

Ex. K (cmol_c∙kg⁻¹)

Savelugu

2624

81

19

43

0.04

3.20

0.10

Yendi

2338

77

17

31

0.06

4.18

0.12

West Mamprusi

2627

44

17

31

0.07

5.10

0.10

Kumbugu

2660

64

17

31

0.06

3.44

0.12

Zabzugu

2309

116

39

93

0.07

5.60

0.10

Gushegu

2403

64

17

31

0.07

3.10

0.10

Saboba

2721

31

17

31

0.03

7.20

0.20

Karaga

2005

44

19

44

0.07

2.10

0.30

Tamale Metropolitan

3442

39

19

44

0.09

2.70

0.73

East Gonja

3535

58

17

31

0.06

4.94

0.40

Tolon

3052

72

19

44

0.05

5.50

0.10

Nanumba South

2397

64

17

31

0.06

3.41

0.10

Nanumba North

3010

71

17

31

0.06

3.90

0.10