WASHINGTON — Get back to work.

The National Farmers Union, the American Farm Bureau Federation and more than 500 other agriculture, conservation, rural development, energy and other groups are getting vocal about the lack of a new farm bill and the U.S. House’s continuing failure to pass the legislation.

The groups, which represent millions of voters from the East Coast to the West Coast, from the Great Plains to Texas and the Gulf Coast, want the House of Representatives to get back to work on a farm bill. The groups signed on to a letter sent to John Boehner, speaker of the house, dated July 2.

“America’s agriculture, conservation, rural development, finance, forestry, energy and crop insurance companies and organizations strongly urge you to bring the farm bill, (H.R. 1947, the Federal Agriculture Reform and Risk Management Act of 2013) back to the floor as soon as possible,” the letter reads.

The groups, which represent interests from the environment, farmland preservation, rural development, commodity crops, including produce, fiber and forestry and livestock, agribusinesses, hunting and food companies, are urging Boehner and the U.S. House to maintain a unified farm bill when lawmakers return from their Independence Day vacation.

“We believe that splitting the nutrition title from the rest of the bill could result in neither farm nor nutrition programs passing and urge you to move a unified bill forward,” the groups said in their letter.

Boehner was unable to muster enough yea votes in the GOP-majority House to pass its latest version of the bill, with 234 nays and 195 yeas. The Senate passed its version of the farm bill on June 10 on a 66-27 vote.

“Farm bills represent a delicate balance between America’s farm, nutrition, conservation and other priorities and, accordingly, require strong bipartisan support. It is vital for the House to try once again to bring together a broad coalition of lawmakers from both sides of the aisle to provide certainty for farmers, rural America, the environment and our economy in general and pass a five-year farm bill upon returning in July,” the groups said.

The 2008 farm bill was extended at the end of 2012. That extension expires on Sept. 30.

The NFU board of directors also passed a resolution on July 1 that expressed the group’s disappointment with the House in failing to pass a new farm bill.

“The expiration date of the 2008 farm bill has already lapsed once, leading to an extension to Sept. 30, 2013. Congress cannot allow the bill to expire again, we simply cannot afford it,” the group said in its resolution.

The NFU resolution also called for maintaining a unified farm bill.

“Some have suggested splitting farms programs and nutrition programs into separate bills. Not only would this be a jarring disruption to the historic coalition of urban, rural and conservation groups, it would also likely effectively kill both bills, producing no legislative action for either,” the group said.