Dr. Sidney Ishee, 55, professor of agricultural economics at the University of Maryland, died Oct. 27 at Leland Memorial Hospital after an apparent heart attack. He was stricken at a parking lot on the College Park campus.

A member of the agricultural economics faculty since 1956, Dr. Ishee specialized in the economics of land use and in tax structure as it applies to farmland in the urban fringe. He taught both undergraduate and graduate courses. He also conducted research projects.

He was born in Bay Springs, Miss. After serving in the U.S. Navy in 1944-46, he earned a bachelor's degree from Mississippi State University. iHe later received master's and doctoral degrees from Pennsylvania State University.

He was the author of a number of bulletins and wrote or contributed to four books in his field. As a member of the tax committee of the Maryland State Grange and the Maryland Farm Bureau, Inc. since 1957, he had contributed to a series of publications involving taxes on farmers and tax assessments of agricultural land.

Dr. Ishee was a member of the American Farm Economics Association, the American Economic Association and the Econometric Society. He lived in College Park.

He is survived by his wife, Stella, and a son, Christopher, both of College Park; his mother, Vera Ishee of Bay Springs, and four brothers and two sisters.