"This day is representative of the martyrdom of those men who lost their lives on the roads during the movement," said farmer leader Gurnam Singh Chaduni from Singhu border, one of the key protest sites.
The legislation the farmers object to, introduced in September last year, deregulates the sector, allowing farmers to sell produce to buyers beyond government-regulated wholesale markets, where growers are assured of a minimum price.
Small farmers say the changes make them vulnerable to competition from big business, and that they could eventually lose price support for staples such as wheat and rice.
The laws were aimed at empowering small farmers, but the government failed to convince some farmers who have been opposing the new laws, Modi had said.
The bill is scheduled to be tabled in the upper house of parliament later on Monday (November 29).