The applied doses of K fertilizer increased soil exchangeable
K content at depths between 0 and 20 cm as determined in soil
samples taken in both ratoons 6-mo of age. Exchangeable K
levels in the first and second ratoons reached values of 0.1
and 0.3 cmolc kg-1, respectively, when the highest dose of K
fertilizer (195 kg K2O ha-1) was used (Figure 2a)