Stillage is a residual liquid waste distillation of ethanol that contains a lot of potassium (K).
Stillage utilization as a replacement for KCl fertilizer is expected to reduce production costs and
capable to cope with environmental problems. The objectives of this study were 1) to determine
effect of the combination of K source from KCl and stillage on sugarcane uptake of N, P and K,
and 2) to define effect of the combination of K source from stillage and KCl to soil chemical
properties. This experiment was conducted by using Randomized Complete Block Design
(RCBD) with four replications and was designed with two factors; first factor was the dose of K
with two levels, i.e. 200 kg/ha and 300 kg/ha; second factor was the combination of KCl and
stillage K in five ratios; they were 100%:0%; 75%:25%; 50%:50%; 25%:75% and 0%:100%.
This study results showed that doses of K and combination K source of KCl and stillage were not
significant on sugarcane uptake of N, P and K, but the highest uptake was in treatment with a
dose of 300 kg/ha and treatment C3 (25% KCl : 75 % stillage). Thus, stillage can be applied as a
source of K to replace KCl and it can reduce the sugarcane production cost.