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Text File  |  1992-09-02  |  420b  |  11 lines
  1. weedkiller, or herbicide. Chemical that kills
  2. some or all plants. Selective herbicides are
  3. effective with cereal crops, as they kill all
  4. broad-leaved plants without affecting the
  5. grasslike leaves. Those that kill all plants
  6. include sodium chlorate and paraquat; see
  7. also Agent Orange. The widespread use of
  8. weedkillers in agriculture has led to a
  9. dramatic increase in crop yield but also to
  10. pollution of water supplies.
  11.