Abstract:Soils with low potassium (K) availability require corrective fertilization for grain crops. The recommended rate to increase K availability up to the critical level depends on the soil K buffering capacity (KBC). This study aimed to quantify the KBC and recalculate the rates necessary to reach the K critical level in 23 soils from Southern Brazil. Soil samples were incubated with six K rates, that were thus grouped according to CEC pH7.0 : below 7.5 cmol c dm -3 (0, 30, 60, 90, 120 and 180 kg K 2 O ha -1 ); fr… Show more
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