Adhoc issued a new report on land disputes for all of 2014 and the first half of 2015, detailing 140 complaints involving nearly 10,000 families and nearly 25,000 hectares.
In an interview with VOA Khmer, Naly Pilorge, director of LICADHO says the effects of the measure would discourage any form of citizen mobilization.
An estimated 600,000 people are employed by garment manufacturing, a major economic driver for the country.
Sok Bun was charged with intent to commit violence and will be held at a Phnom Penh prison pending trial.
The National Assembly passed the bill earlier this month despite widespread opposition from pro-democracy and rights groups and the international community.
The ruling Cambodian People's Party, or CPP, passed the measure Monday after the opposition Cambodian National Rescue Party, or CNRP, boycotted the vote.
Critics fear the law will be used to shut down or curtail the activities of organizations critical of the government.
According to a draft of the law obtained by VOA Khmer, NGOs not registered with the Ministry of Interior will have to cease their activities or face fines up to $2,500.
Hundreds of opponents to a controversial law to regulate NGOs met in a hotel in Phnom Penh Tuesday.
Critics of the law say it allows for retributive lawsuits by officials who may feel slighted by public criticism.
Recently about 230 Cambodian fisherman were rescued from illegal operations off the coast of Indonesia.
The United Nations held a memorial event on Wednesday to honor the victims of the 1995 Srebrenica genocide during the Bosnian war, the worst mass killing on European soil since World War Two. Mike Richman report for VOA from Washington.