EB1458 An Economic and Engineering Comparison of Replacing Overhead with Trickle Irrigation of Red Raspberries. Richard W. Carkner and Thomas W. Ley. Compares and contrasts the use of traveling big gun, hand move sprinklers, and trickle irrigation systems. Offers an analytical model based upon costs of each system as well as conversion costs. Reprinted January 1989. 26 pages $1.00.