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APPENDIX: Table I

Soil data in relation to canopy and orientation. Below canopy are means of 0.375R and 0.75R. Beyond canopy vertical influence are calculated as average between 2.0R and 2.5R.

Below canopy Beyond canopy


Total mean
NE SW NE SW
pH Mean 5.674 5.798 4.978 5.014 5.325 Max 6.630
SD 0.420 0.483 0.312 0.269 0.499 Min 4.490

OM (%) Mean 1.467 1.631 0.744 0.941 1.165 Max 2.290
SD 0.333 0.394 0.231 0.205 0.421 Min 0.350

N (%) Mean 0.072 0.078 0.036 0.048 0.056 Max 0.130
SD 0.025 0.040 0.012 0.018 0.029 Min 0.010

C:N Mean 15.173 16.038 16.986 16.932 16.508 Max 47.270
SD 2.463 10.416 5.748 10.216 7.635 Min 8.310

P (ppm) Mean 26.792 31.100 28.025 21.275 26.917 Max 64.800
SD 17.040 15.595 15.293 12.601 15.056 Min 0.000

K (ppm) Mean 102.478 150.588 57.003 60.700 89.600 Max 237.780
SD 34.784 40.323 10.205 10.707 42.300 Min 41.450

Ca (meq/100 g) Mean 2.572 3.251 0.804 1.348 1.859 Max 5.590
SD 1.018 1.391 0.247 0.402 1.141 Min 0.460

Mg (meq/100 g) Mean 0.348 0.478 0.135 0.203 0.274 Max 0.720
SD 0.116 0.142 0.042 0.073 0.146 Min 0.080

CEC (meq/100 g) Mean 8.685 9.663 6.703 6.849 7.678 Max 13.910
SD 2.323 2.937 1.893 2.630 2.616 Min 2.340

Sand (%) Mean 85.020 84.412 86.192 82.496 84.386 Max 91.833
SD 3.841 2.878 3.329 5.491 4.181 Min 70.085

Silt (%) Mean 12.564 14.619 12.667 16.063 14.340 Max 27.493
SD 3.641 2.910 3.182 5.054 3.928 Min 7.214

Clay (%) Mean 1.224 1.362 1.141 1.440 1.274 Max 2.422
SD 0.267 0.256 0.195 0.449 0.323 Min 0.785

Density (g/cm3) Mean 1.396 1.378 1.664 1.559 1.501 Max 1.883
SD 0.138 0.154 0.157 0.137 0.173 Min 1.082