Soil available K (mg kg-1) 2008 (n =228) 2018 (n=228)
Mean 96.8 118.0
Standard Error 21.7 62.5
Min 62.6 35.9
Max 186.0 373.5
Mid-value 84.2 103.6
lower quartiles 81.4 72.0
Upper quartiles 106.1 139.0