weed – n. plant that tends to grow where not wanted and to prevent the growth of more desirable plants usually by taking up space
spray – v. to put a stream of small drops of liquid on something
herbicide – n. chemical used to destroy plants, especially weeds
tractor – n. motor vehicle with large back wheels and thick tires used on farms for pulling heavy loads and machinery
rig – n. piece of equipment or machinery used for a particular purpose
option – n. the chance or ability to choose something or to choose between two or more things
pesticide – n. chemical substance used to kill harmful insects, small animals, wild plants, and other unwanted organisms