California will become the first U.S. state to require farmers to pay overtime to field workers and fruit pickers under a bill signed on Monday by Democratic Gov. Jerry Brown.

The bill would phase in overtime pay for farmworkers from 2019 to 2022. In an industry where a work week during the harvest season can be as long as 60 hours, the measure requires farmers to pay overtime after eight hours per day or 40 hours per week.

"We're shedding tears of joy right now," said Arturo Rodriguez, president of the United Farm Workers Union, which lobbied for years for an eight-hour day for agricultural employees.