Context: The following sulfonylureas have been commercialized for weed control: amidosulfuron, azimsulfuron, bensulfuron-methyl, chlorimuron-ethyl, ethoxysulfuron, flazasulfuron, flupyrsulfuron-methyl-sodium, halosulfuron-methyl, imazosulfuron, nicosulfuron, oxasulfuron, primisulfuron-methyl, pyrazosulfuron-ethyl, rimsulfuron, sulfometuron-methyl Sulfosulfuron, terbacil, bispyribac-sodium, cyclosulfamuron, and pyrithiobac-sodium. Nicosulfuron, triflusulfuron methyl, and chlorsulfuron are broad-spectrum herbicides that kill plants by inhibiting the enzyme acetolactate synthase. In the 1960s, more than 1 kg/ha (0.89 lb/acre) crop protection chemical was typically applied, while sulfonylureates allow as little as 1% as much material to achieve the same effect.

Question: What are sulfonyureas commonly used for?
Answer: weed control

Question: Nicosulfuron, triflusulfuron methyl and chlorsulfuron can be classified as what type of pesticides?
Answer: broad-spectrum herbicides

Question: The restriction of what enzyme allows broad-spectrum herbicides to kill plants?
Answer: acetolactate synthase

Question: The amount of material used as a crop protection measure decreased from 1kg/ha in what year to its current 1%?
Answer: 1960s

Question: What has acetolactate synthase been used for commercially?
Answer: Unanswerable

Question: What is acetolactate synthase classified as when used on plants?
Answer: Unanswerable

Question: In what year was acetolactate synthase created?
Answer: Unanswerable

Question: How much acetolactate synthase was applied in the 1960's?
Answer: Unanswerable

Question: What was acetolactate synthase used for in the 1960's?
Answer: Unanswerable