Table 3.
Summary statistics (mean, SD, Minimum and Maximum) and percent of farms below critical levels of plant nutrient content in Meru and Nyandarua regions.
| Plant nutrients | Meru (N = 99) | Nyandarua (N = 93) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Min | Max | Mean | Std. Dev. | % farms below critical value | Min | Max | Mean | Std. Dev. | % farms below critical value | |
| N (g kg−1) | 25.9 | 56.3 | 40.3 | 5.3 | 73.0 | 33.3 | 60.6 | 47.4 | 5.0 | 22.7 |
| P (g kg−1) | 1.9 | 5.3 | 3.2 | 0.8 | 24.0 | 2.4 | 5.8 | 3.7 | 0.7 | 1.2 |
| K (g kg−1) | 16.7 | 73.2 | 47.3 | 10.9 | 22.0 | 14.8 | 76.1 | 51.6 | 12.5 | 14.9 |
| S (g kg−1) | 2.7 | 5.3 | 3.5 | 0.5 | 18.0 | 2.8 | 12.4 | 4.5 | 1.3 | 1.2 |
| Ca (g kg−1) | 6.5 | 27.1 | 15.5 | 3.3 | 0.0 | 12.7 | 36.4 | 18.2 | 4.2 | 0.0 |
| Mg (g kg−1) | 5.0 | 16.6 | 9.0 | 2.6 | 0.0 | 4.4 | 16.6 | 7.8 | 2.3 | 0.0 |
| Zn (mg kg−1) | 18.3 | 78.9 | 31.9 | 9.4 | 2.0 | 22.5 | 101.8 | 37.7 | 10.6 | 0.0 |
| B (mg kg−1) | 15.8 | 44.7 | 31.5 | 6.5 | 17.0 | 6.5 | 42.1 | 23.7 | 9.0 | 55.2 |
| Cu (mg kg−1) | 3.5 | 16.3 | 9.8 | 3.1 | 5.0 | 5.0 | 26.0 | 11.6 | 4.5 | 1.2 |