Potassium requirements of pasture on pumice soils

Abstract On pumice soils at Mamaku near Rotorua (initial quick test (QT) K 4) and Pouakani near Whakamaru (initial QT K 2), pasture yield responses to applications of 0, 75, 150, 300 and 600 kg K/ha/yr (all as three equal split applications) plus 300 kg K/ha/yr applied once in the spring were measured for 3 years. There was a significant total pasture dry matter (DM) response to up to 150 kg K/ha/yr at Mamaku in two and to 75 kg K/ ha/yr in one of the first three years, but no significant difference (P