Devinder Sharma, an agriculture expert who has spent the last two decades campaigning for income equality for Indian farmers, said they were not only protesting the reforms but also "challenging the entire economic design of the country".
Protesters have broken the barricades at Karnal bypass to enter Delhi where farmers tractor rally is now underway.
Since November, protesters have camped at the entry points to New Delhi, opposing farming laws which they say will invite conglomerates to dominate the agricultural sector.
At Delhi's Mukarba Chowk, security personnel used tear gas on groups of farmers as they tried to break barricades and cemented barriers with tractors. They have also advised commuters to NH 44, GT Karnal road, outer ring road, Signature bridge, GT road, ISBT ring road, Vikas marg, ITO, NH 24, Nizammudin Khatta, Noida link road, Peeragarhi and Outer Delhi, East and West Delhi border areas due to ongoing farmer protests.
The police fired tear-gas shells and lathi-charged the protesters on multiple occasions as farmers remained adamant to move towards the Red Fort.
NDTV reported that chaos unfolded at the Singhu border, which divides Delhi and Haryana, and Tikri border in the western part of the national capital where thousands were seen marching with flags, many of them on tractors.
"The situation is peaceful and we are trying to convince them to go towards the designated route at the specified time, he said".
Violence erupts at Delhi's Mukabra Chowk after cops clashed with protesting farmers.
He was one of hundreds of protesters, some on horseback, who broke away from the main route of the tractor protest to head for central New Delhi, which hosts an annual Republic Day military parade.
Earlier today, reports of farmers breaking barricades to enter Delhi and resorting to vandalism poured from several parts of the city.
Meanwhile, the Samyukta Kisan Morcha has condemned and regretted the "undesirable and unacceptable events" that took place on Tuesday and thanked farmers for the unprecedented participation in their tractor march.
Patrolling has been intensified at power substations in Delhi following a threat from the banned Sikhs for Justice outfit to disrupt the city's supply during the Republic Day celebrations.
Thousands more, steering tractors bearing the flags of India and farm unions, had streamed in from neighbouring states for several days ahead of the rally, planned to coincide with celebrations of Republic Day.