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Krishi Vigyan Kendra, Sultanpur conducted 156 demonstrations on Lentil variety PL-406 during two consecutive years from 2016–17 to 2017–18. The critical inputs were identified in existing production technology through meetings and discussions with farmers & on the basis of soil sampling. Delayed sowing & use of higher seed rate resulting into dense plant population, uneven plant population, uncontrolled weeds, ignorance about fertilizers and lack of plant protection measures were the predominant identified causes of low productivity of Pulses in district Sultanpur. In the same sequence the other parameters like technological impact, economical impact and extension gap were analyzed for Impact assessment of front line demonstration on lentil crop and feasibility of demonstrated technologies at grass root levels. The results of two consecutive years study revealed that the yield under demonstration plots was 16.9 q /ha as compared to 12.46 q /ha in traditional farmer practices plots. This additional yield of 4.44 q /ha and the increase in average lentil productivity by 35.64 per cent may contribute to present lentil requirement on national basis. The average of technology gap, extension gap and technology index were found to 4.42, 2.1 and 11.5 per cent respectively. The results clearly indicate the positive effects of FLDs over the existing practices. Benefit cost ratio was recorded to be higher under demonstrations against control treatments during the years of experimentation.

Key words: Impact, Lentil crops, Cluster front line demonstration, Technology gap.