Some Maryland poultry farmers are upset that for the first time they will have to comply with federal pollution rules regarding chicken manure. Environmental Protection Agency officials informed farmers in a series of meetings on the Eastern Shore that they intend to enforce the rules. Farmers will have to get permits if any manure from their flocks is washing off their land into drainage ditches and streams. State officials say more than half of Maryland’s 800 poultry farmers have filed notices to obtain the permits. The EPA says agriculture is the biggest source of nutrients that degrade the water quality of the Chesapeake Bay.