Dr. Favreau: With respect to sugar beet models, check the European Journal of Agronomy, vol.4, no.3, 1995, pages 269-280. " Crop models and decision support systems for yield forecasting and management of the sugar beet crop ". Albert Weiss ALBERT WEISS, DEPT. OF AGRICULTURAL METEOROLOGY UNIVERSITY OF NEBRASKA-LINCOLN, LINCOLN,NE 68583-0728 VOICE (402)472-6761, FAX (402)472-6614 E-MAIL [log in to unmask]