Int.J.Curr.Microbiol.App.Sci (2020) 9(6): 170-175 170 Original Research Article https://doi.org/10.20546/ijcmas.2020.906.022 Yield gap Analysis of Rapeseed- Mustard through Cluster Front Line Demonstrations in Darbhanga District of Bihar, India Ram Prawesh Prasad 1 *, D. Shekhar 1 , M. S. Kundu 2 , A. P. Rakesh 1 , Amba Kumari 1 and Chandan Kumar 1 1 Krishi VigyanKendra, Jale,Darbhanga(Bihar)-847302, India 2 Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar-848125, India *Corresponding author ABSTRACT Introduction Mustard is among the oldest recorded spices as seen in Sanskrit records dating back to about 3000 BC (Mehra, 1968) and was one of the first domesticated crops. Originally it was the condiment that was known as mustard and the word was derived from the Latin mustum. Must, the expressed juice of grapes or other fruits mixed with ground mustard seeds to form mustumardens (‘hot or burning must’) were a Roman speciality condiment. Romans’ love for mustard carried the same throughout Europe where it became popular for seasoning meat and fish. Apart from its use as a condiment, its medicinal value also was recognized early, as it was mentioned by Pythagoras in 530 BC as a remedy for scorpion bites. International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 9 Number 6 (2020) Journal homepage: http://www.ijcmas.com Mustard is among the oldest recorded spices as seen in Sanskrit records dating back to about 3000 BC (Mehra, 1968) and was one of the first domesticated crops .In India, the mustard - rapeseed is the most important oil seed crop after groundnut accounting around 25 per cent of total oilseed production. It is one of the important oilseed crop of the Indo-gangetic plains. Indian mustard (Rai) cultivation has occupied about 85-90 per cent of total area under cultivation of mustard – rapeseed. The present study was carried out at KVK, Jale, Darbhanga Bihar to know the yield gaps between improved package and practices(IP) under Cluster Font Line Demonstrations(CFLDs) and farmers practices (FP) of rapeseed mustard. The study found, the yield of rapeseed mustard in improve practices (IP) under irrigated condition range from 14.04to15.67, where as in FP it range between9.8to 10.25q/ha. The percent increase in yield IP over FP was recorded in the range of 37.64 to 55.61.The extension gap and technological index were range between 3.84-5.5 q/ha and 30.20percent respectively. The trend of technological gap reflected to farmer cooperation in carrying out demonstrations with on ranging result in subsequent years. The cost benefit ratio was 2.49 and 2.83under demonstration, while it was1.52to 2.0under control plots. By conducting Cluster Front Line Demonstrations (CFLDs) of proven technologies, yield potential of rapeseed- mustard crop should be enhanced to a great extend with increase in the income level of farming community. Keywords Rapeseed –Mustard CFLDs, Technological gap, Extension gap, Technological gap, B:C:R Accepted: 14 May 2020 Available Online: 10 June 2020 Article Info