The front line demonstrations for isabgol (Plantago ovata) were undertaken to assess the efficacy of recommended cultivar RI-1 for augmenting the yield gaps at farmers' fields in Barmer district of Rajasthan during two consecutive seasons. Adoption of improved cultivar and recommended practices increased mean seed yield of isabgol by 41 and 46 percent over farmers practice during first and second year, respectively Similarly, technology index was declined from 25.5 percent in 2011 to 22.25 percent in second year indicating feasibility of interaction between variety and packages of practices. The extension gap was 2.60 and 2.95 q ha'1 during two seasons tested. The economics showed that an approximate four time's higher benefit could be realized with the adoption of improved packages over traditional cultivation practice during this study.
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Lokesh Kumar Jain (2017) studied this question.