Mustard is an important Rabi oilseed crop of India. It occupies about 24.70 per cent of area and 48.28 per cent of production of the total oilseed production in India. Front line demonstrations on mustard variety Bio-902 (Pusa Jai Kisan) were conducted at farmers’ fields in district Jhunjhunu (Rajasthan) during Rabi seasons of the year 2005-06, 2006-07, 2007-08 & 2009-10. On four years overall average basis about 15.9 per cent higher grain yield was recorded under demonstrations than the farmers’ traditional practices. The extension gap, technology gap and technology index were 217.5 kg/ ha, 375 Kg/ha and 18.8 %, respectively. An additional investments of Rs.1136.5 per ha coupled with scientific monitoring of demonstrations and non-monetary factors resulted in additional return of Rs. 3848 per ha. Fluctuating MSP sale price of mustard during different years influenced the economic returns per unit area. On four years overall average basis Incremental benefit: Cost ratio was found as 3.4

Keyword: Mustard; Demonstration; G