Here is another reference on the Zadoks scale and wheat phenology that may be helpful in comparing different phenology schemes. Tottman,D.R. and R.J.Makepeace.1979. An explanation of the decimal code for the growth stages of cereals, with illustrations. Ann. Appl. Biol. 93:221- 234. Al 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]