Potassium accumulation in leaf tissue at 12-mo of age
in both ratoons was significantly influenced by doses of
K-fertilizer applied to the soil (Figure 4). Potassium
level in stalk (Figure 4a), leaves (Figure 4b), and in plant
aerial part (Figure 4c) followed a quadratic increase with
the K2O doses applied to the first ratoon. The highest
value of K in stalks (99.4 kg ha-1) was caused by the
dose 164 kg K2O ha-1; in leaves (88.5 kg ha-1) by 110 kg
K2O ha-1, and in plant aerial part (184.8 kg ha-1) by 127
kg K2O ha-1. In the second ratoon, quadratic increments
of K were observed in stalks (Figure 4a) and in the
aboveground plant part (Figure 4c). The highest value of