The blockade, that began at 12 p.m., would continue till 3 p.m.
However, ambulances would not be stopped.
The Congress and the Centre of Indian Trade Unions (CITU) have extended support to the blockade.
Rashtriya Kisan Mazdoor Sangh National Convener Shivkumar Sharma told reporters on Friday that the "agitation would be peaceful".
Heavy deployment of police force is in place to prevent any untoward incident.