A field experiment was conducted at Main Agricultural Research Station, Agriculture College, Dharwad, during 2002-03 to study the fertilizer requirement of sweet corn grown on Vertisols of zone-8 of Karnataka.  The growth parameters of sweet corn viz., leaf area index and total dry matter production were influenced favourably with increasing levels of NPK application. The yield and yield components of sweet corn were also influenced favourably with increasing levels of NPK application. A reduction in N application below 75 per cent of recommended dose of nitrogen (RDN) reduced the yield parameters and fresh cob yield significantly. The fresh cob yield of sweet corn in treatment which received 75 per cent RDN along with 100 per cent recommended dose of phosphorus (RDP)   and recommended dose of potassium (RDK)  was on par with the highest yield obtained in the treatment which received highest levels of all the three nutrients i.e., 100% RDN + 100% RDP + 125% RDK indicating the possibility of reducing N level by 25 per cent without affecting yield levels of sweet corn.