The assailants also set on fire a thatched house belonging to Dalit families in Gandakya ki Dhani in Dantaramgarh area here, police said.
"Several members of a caste attacked Dalit people following a land related dispute which left nine people injured. Two of them were referred to SMS hospital in Jaipur for treatment," police said.
Both the dalits and Kumawats (an OBC community) stake claim on the land and the matter is sub judice.
Dalit families have their houses on the land.
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After the incident, Additional SP Rakesh Kachwal and others rushed to the spot and additional policemen were deployed in the area.
A case has been registered and seven persons have been arrested, SP Sikar Dr Ravi said.
Meanwhile, a delegation of CPI(M) met the SP to demand security for the Dalit families.
Former CPI(M) MLAs Amra Ram, Pemaram and others also demanded stern action against the accused involved.
This is the second such incident in Rajasthan within less than a month after the incident of Dangawas, Nagaur where a clash left six persons including five Dalits dead.
CBI has taken over the investigation of the Dangawas incident.