The mammoth farmers march to Mumbai is a "stunning example of people's power", Mr Gandhi said on Twitter.
The Congress, he added, stands with the farmers and tribals marching to protest against the apathy of the central and state governments.
"I appeal to PM Modi and the CM to not stand on ego and to accept their just demands," Mr Gandhi tweeted.
Mr Fadnavis said today his government was "sensitive and positive" towards the demands of farmers and tribals, who have marched from Nashik to Mumbai to draw the administration's attention towards their problems.
Mr Fadnavis was responding to a discussion in the Assembly, initiated by Leader of Opposition Radhakrishna Vikhe Patil, who lauded the farmers for their peaceful protest.
The farmers plan to surround the Assembly complex to press for their demands of an unconditional loan waiver, and transfer of forest land to tribal farmers who have been tilling it for years.
The CPM-affiliated All India Kisan Sabha is spearheading the protest.
The Shiv Sena has also lent its support to the farmers stir.