Terbutryn is primarily used as a selective herbicide in agriculture, especially in the cultivation of crops like corn, barley, wheat, and potatoes. It controls broadleaf weeds and some grassy weeds by inhibiting photosynthesis in susceptible plants. Due to its pre-emergent and early post-emergent activity, it is commonly applied to soil before weeds fully develop. It is effective in reducing weed competition, which helps improve crop yield and quality. Terbutryn is often used in combination with other herbicides to broaden the spectrum of weed control. Its application is particularly valuable in regions where resistant weed species are a concern, although care is taken to avoid leaching into groundwater due to its persistence in certain soil types.