Police took 79 workers of the Jat body into preventive custody, but later released all of them.
The Akhil Bharatiya Jat Sangarsh Samiti also extended support to the Manch.
The Samiti's district President Bhoop Singh said the government should accept their demands as they were genuine.
The district administration had made elaborate security arrangements to prevent any untoward incident during today's 'jail-bharo' protest, which was held peacefully, police said.
The members of the community have been staging peaceful
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Internet services had been suspended in the vicinity of dharna sites to check spread of rumours. Authorities have also imposed prohibitory orders under Section 144 of CrPC in some areas of the sensitive districts, banning gathering of five or more people.
Paramilitary forces are out in sensitive areas while heavy police force has been deployed to maintain strict vigil.
During a similar stir a year ago, there were 30 deaths and widespread destruction of property. This time, Haryana has been put on maximum alert, officials said.
Rapid Action Force has been deployed at Munak canal in Sonipat district to ensure uninterrupted water supply to the national capital. The agitators had damaged the canal during last year's stir.
Apart from the quota demand, the agitators are demanding release of arrested Jat youths from jails, withdrawal of cases registered during last year's agitation and grant of government jobs to the kin of youths killed and those injured during the earlier stir.