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