Production of sweet corn under organic production system was applied both solid and
liquid organic fertilizer. Such production system might alter potassium availability to yield
performances of sweet corn. The relationship between potassium uptakes and yields of sweet
corn were determined. Twenty sweet corn varieties were grown under organic environment
where soil was fertilized with 30 tons ha-1 of cattle-based vermicompost. Each plant was
applied with thitonia-enriched liquid organic fertilizer of 50, 100, 200, 300 ml at 14, 21, 28 and
35 days of planting. Yield performances were recorded leaf potassium content, green biomass
per plant, weight of husked ear, and weight of unhusked ear, sweet corn yield per plot and days
to harvesting. Potassium uptakes by plants were calculated as ratio of plant potassium content
and shoot dry weight per plant. Results indicated that potassium uptakes by sweet corn
significantly increased shoot dry weight per plant (r=0.932), weight of husked ear (r=0.635) and
sweet corn yield per plot (r=0.856). However, potassium uptakes by sweet corn did not
significantly increase leaf potassium content (r=0.539) and weight of unhusked ear (r=0.515).
In addition, potassium uptakes by sweet corn did not significantly decrease days to harvesting
(r=0.130).