South Dakota Gov. Dennis Daugaard has signed into law his plan to recruit teachers into critical fields, give bonuses to top teachers and phase out tenure.
Daugaard announced Tuesday he has signed the bill. He says the measure will eventually spend $15 million a year on great teachers to improve student achievement.
But the union representing South Dakota teachers has said it plans to seek a statewide public vote aimed at blocking the law.
The bill includes the governor's original plan to give $5,000 annual bonuses to the top 20 percent of teachers, but school districts could create their own reward plans or not take part at all.
The bill also establishes scholarships to attract college students into teaching in critical subjects and gives bonuses to math and science teachers.