21.   Soybeans have been genetically altered so that they can tolerate applications of an herbicide that kills the weeds in the same field.

22.   The company is developing wheat resistant to its Roundup herbicide, which would allow the herbicide to kill weeds while leaving the wheat unscathed.

23.   This type of farming reduces plowing to prevent soil erosion and requires more herbicide to kill weeds.

24.   This is also the time when crop dusters are spraying herbicides over north Kansas fields to kill weeds and allow more grass to grow for grazing cattle.

25.   He said investigators have looked at tableware in the palace, and taken samples from a container of a chemical used to kill weeds.

26.   It will selectively kill the weeds, but not affect the grass.