The present study was conducted to examine the growth and economic impact of TMO on farm economy of major oilseeds growing districts of Karnataka and the state as a whole. The study period was divided into Period-I (Pre TMO) from 1972-73 to 1985-86, Period –II (Post TMO) from 1986-87 to 2009-10 and Overall period from 1972-73 to 2009-10. Primary data survey was done for groundnut crop in Tumkur district, Karnataka. The results of the CGR analysis revealed that, the growth in area, production and yield of total oilseeds found to be positive during Period-I except area growth in Belgaum and Dharwad districts and yield growth in Bijapur and Gulbarga districts. During Period-II in most of the study districts, area showed declining growth except in Belgaum and Dharwad and Bijapur and Gulbarga for yield growth. The quantities of inputs and labour utilized and per hectare output realized were more in beneficiaries.