Ronald Dean Plowman, Logan, will be appointed head of the Agriculture Department's largest science agency, Agriculture Secretary Richard E. Lyng announced Friday.

Plowman, 59, will succeed Terry B. Kinney as administrator of the Agricultural Research Service. Kinney is retiring from the $77,500-a-year post. Plowman has been head of Utah State University's department of animal, dairy and veterinary sciences since 1984. He previously worked for the science agency he will now supervise.