Table 3 Comparison of the “undamaged” and the “damaged” sites regarding grub density, environment and management; site categories: “undamaged site” = grub damage had never been observed by the farmers (low risk) and “damaged sites” = grub damage had recently occurred (high risk)
Site categories | Undamaged sites (= low risk) | Damaged sites (= high risk) | ||||||
|---|---|---|---|---|---|---|---|---|
Minimum | Maximum | Mean/median | +/− SEM | Minimum | Maximum | Mean/median | +/− SEM | |
Grubs (all species) per m2** | 1.04 | 95.83 | 30.83 | 10.47 | 26.04 | 303.13 | 117.63 | 27.16 |
Grub damages 2011 (ord) | 0 | 0 | 0 | / | 0 | 1 | 1 | / |
Humus (%) t | 4.57 | 11.95 | 8.13 | 0.72 | 5.89 | 12.53 | 9.93 | 0.67 |
Nmin (kg/ha) | 5.00 | 36.00 | 11.90 | 2.81 | 7.00 | 24.00 | 13.20 | 1.50 |
DOC (kg/ha)* | 48.00 | 238.00 | 102.80 | 17.07 | 86.00 | 273.00 | 154.20 | 21.96 |
pH-H2O | 5.16 | 6.13 | 5.53 | 0.10 | 5.15 | 5.75 | 5.49 | 0.06 |
Clay (%) | 13.08 | 21.10 | 15.94 | 0.74 | 11.90 | 22.83 | 16.44 | 1.03 |
Silt (%) | 29.60 | 42.58 | 34.39 | 1.27 | 27.95 | 38.31 | 33.15 | 1.00 |
sand (%) | 41.06 | 57.26 | 49.65 | 1.81 | 38.86 | 56.78 | 50.39 | 1.75 |
A-horizon max. (cm) eBOD | 20.00 | 30.00 | 24 | 1.25 | 15.00 | 30.00 | 24 | 2.21 |
Humus db (%) eBOD | 2.20 | 4.90 | 3.34 | 0.31 | 2.20 | 5.10 | 3.79 | 0.35 |
Water supply (ord) eBOD | 3.00 | 7.00 | 5 | / | 3.00 | 5.00 | 5 | / |
Altitude above sealevel (m) | 838.86 | 1103.99 | 983.68 | 25.68 | 850.93 | 1094.65 | 966.47 | 24.67 |
Slope (degrees) | 4.92 | 22.24 | 13.03 | 1.71 | 3.07 | 24.13 | 14.53 | 1.85 |
Aspect (degrees) | 3.19 | 169.62 | 66.55 | 15.21 | 2.32 | 147.28 | 74.86 | 17.01 |
Usual number of cuts/year* | 1.00 | 4.00 | 2.10 | 0.23 | 0.00 | 2.00 | 1.40 | 0.22 |
Usual number of grazings/year | 0.00 | 2.00 | 1.00 | 0.15 | 1.00 | 4.00 | 1.60 | 0.40 |
Usual manure amount/year (ord) | 1.00 | 3.00 | 1.5 | / | 0.00 | 3.00 | 1 | / |