Table 2 Summary statistics (Mean, SD, Minimum and Maximum) and percent of farms below critical levels for potato growth in Meru and Nyandarua regions.

From: Assessment of soil fertility and potato crop nutrient status in central and eastern highlands of Kenya

Variable

Meru (N = 99)

Nyandarua (N = 93)

Min

Max

Mean

Std. Dev.

% farms below critical value

Min

Max

Mean

Std. Dev.

% farms below critical value

pH (CaCl2)

4.2

6.6

5.4

0.6

54.5

3.9

6.2

5.0

0.5

86.2

SOC (g kg−1)

1.4

91.5

31.3

13.6

30.3

19.7

65.2

37.2

10.4

8.6

N (g kg−1)

<0.1

9.0

2.8

1.4

66.7

1.8

5.9

3.3

0.9

20.2

P (mg kg−1)

3.4

258.8

47.1

44.2

46.5

0.9

430.2

23.7

54.5

85.1

K (Cmol kg−1)

0.2

2.7

0.9

0.5

—

0.1

1.6

0.5

0.4

18.1

S (mg kg−1)

1.1

14.1

4.1

2.4

67.7

1.9

20.8

6.1

3.0

31.9

Ca (Cmol kg−1)

1.3

12.3

4.6

2.2

—

1.4

11.4

4.4

2.0

—

Mg (Cmol kg−1)

1.0

5.4

2.4

0.9

—

0.4

2.9

1.3

0.5

—

Zn (mg kg−1)

1.0

20.1

5.1

3.5

—

0.6

27.5

5.6

5.3

—

B (mg kg−1)

0.1

2.3

0.7

0.3

87.9

<0.1

2.6

0.7

0.4

80.9

Cu (mg kg−1)

<0.1

4.3

1.4

1.1

9.1

<0.1

1.7

0.3

0.2

51.0

C-N ratio

8.9

13.3

11.2

0.7

 

8.7

13.3

11.5

0.8

 

Ca-Mg ratio

0.8

4.8

2.0

0.8

 

1.0

6.2

3.6

0.9

 
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