Farm union leaders have begun a day-long fast at various border points near Delhi.
Farmers are protesting against the Centre's three contentious agricultural laws.
Delhi CM Arvind Kejriwal and AAP workers are also observing fast in solidarity with farmers.
Farmer unions have said that protests will also be held in other parts of the country.
Meanwhile, BKU spokesperson Rakesh Tikait reiterated that farmers will not end agitation.
Monday marks day 19 of farmers' protest against the farm laws passed by Parliament in September.
Last week, farmers had observed a peaceful Bharat Bandh against the legislations.
Government has so far held five rounds of talks with farmers’ unions, offering changes to laws.
Farmers are, however, firm with their demand that Centre should repeal the new farm laws.
