The Department of Natural Resources took the first steps in a state rule-making process aimed at safeguarding manure-spreading practices in areas prone to water contamination. But environmental groups pushed for a faster response by the agency and complained the measure was weakened from an initial draft under pressure from farm groups. DNR officials initially took a stronger measure to Gov. Scott Walker for approval. But after objections by farm groups, the agency re-worked the regulations and removed some specific requirements for the state’s largest farms.