Supporters and opponents of several proposed mergers among agricultural seed and chemical companies made their case to lawmakers in Washington Tuesday.

Executives from Dow, DuPont, Monsanto, Bayer and Syngenta argue the proposed new combinations are necessary to continue the research that leads to innovation. But Roger Johnson, president of the National Farmers Union, says the new pairings, including a Chinese state-owned company buying Syngenta, could have the opposite effect.

Mike Mozart, flickr Creative Commons

A group of scientists and environmentalists are calling for an independent review of the chemicals found in the popular herbicide Roundup.

Agriculture giant Monsanto first started selling glyphosate, the major chemical in Round Up, in the 1970s--but it remains controversial.

A band of environment and public health advocates say the chemical mixed with other ingredients could contribute to the risk of cancer and is due for modern tests.

Fred vom Saal is one of them. He is a professor emeritus of biological sciences at the University of Missouri.

Peggy Lowe, Harvest Public Media

No agreement has been reached yet to settle remaining claims in lawsuits over the discovery of genetically engineered Monsanto wheat in an Oregon field in 2013.

All of the lawsuits from across the country have been consolidated in Kansas.

A joint status report filed Monday in U.S. District Court in Kansas says the parties have been exchanging settlement offers.

The last offer from farmer plaintiffs is under consideration by St. Louis-based Monsanto.

Another Kansas Farmer Sues Monsanto

Jul 8, 2013

Another Kansas farmer has filed suit against seed giant Monsanto over the discovery of an isolated field of genetically engineered wheat in Oregon.

Harvey County wheat grower Bill Budde sued Monsanto Friday in a lawsuit seeking class-action status. It's at least the third such lawsuit filed in federal court in Kansas against the St. Louis-based company since the field was discovered in May. Similar lawsuits have also been filed in Idaho and Washington state.

Kansas Farmer Files Suit Against Monsanto

Jun 5, 2013

A Kansas farmer has sued seed giant Monsanto over the discovery of genetically engineered experimental wheat.

Elkhart wheat grower Ernest Barnes filed the suit.

It alleges that when people heard about the unapproved wheat in an Oregon field last week, the news drove down wheat futures prices and caused a backlash from some international markets, which suspended certain imports.

The lawsuit seeks unspecified damages.