Jim Johnson, 55, of Fountain Head Country Club, Hagerstown, scored par four on the first playoff hole and defeated Robert Morris of Argyle to win the Maryland State Golf Association Seniors golf championship today at Suburban. Both shot scratch 73 to force the playoff.

Morris three-putted the 18th green to fall into a tie and three-putted the first playoff hole to lose.

Other age group winners - ages 50-55, gross, Ed Dosek Crofton, 74, net, Dick Kowaleski, Turf Valley, 80-15-65; ages 60-64, gross, Bill Gartner, Argyle, 74, net, Tome Lowe, Manor, 84-14-70; 65-69, gross, Clarence Willis, Baltimore CC, 77, net Ed Ebberts Rolling Road, 81-13-68; 70-74, gross, Bill McFerren. Montgomery Village 80, net, Joe Rodgross, Tom Sommers, Turf Valley, 86, gers, Cartwell, 86-22-64; 75-and-over, net A.I. Vinogradoff, Sparrows Point, 90-15-75. pro Peter Chapin and Air Force badsman amateur Hank Miracle, who tied at 69.

ARMY NAVY - NancY Hollenback defeated Fran Shultz, 3 and 2 , to win the women's club championship yesterdat the Arlington course.

D.C. GOLF ASSOCIATION - George Andre of International and Berenice Morrison of Country Club of Fairfax shared first place in the gross division of the annual mixed-Scotch tournament with Welvin Willard and Trish Horan of Argle yesterday at Wesywood Country Club. Both groups carded 77.

Mr, and Mrs. Brian Turner of Washington won net, 80 13-67, followed by Larry Broggin and Clara of Belie Haven, 82-13 - 69.