Agricultural water management An International Journal

EDITOR-IN-CHIEF: J. van Schilfgaarde, USDA-ARS-Mountain States Area, 2625 Redwing Road, Suite 350, Fort Col- lins, CO 80526, U.S.A.

ASSOCIATE EDITOR: D,C. McWorther, Agricultural and Chemical Engineering, Colorado State University, Fort Collins, CO 80523, U.S,A.

EDITORIAL ADVISORY BOARD:

S.I. Bhuiyan, Manila, The Philippines J. Bouma, Wageningen, The Netherlands R.Q. Cannell, Blacksburg, VA, U.S.A. B.E. Clothier, Palmerston North, New Zealand P.J. Dieleman, Rome, Italy W. Dierickx, Merelbeke, Belgium N.R. Fausey, Columbus, OH, U.S.A. P.M. Fleming, Canberra, A.C.T., Australia J.L. Fouss, Baton Rouge, LA, U.S.A. G.J. Hoffman, Fresno, CA, U.S.A. J.R. Jensen, Zaria, Nigeria F. Kastanek, Vienna, Austria P. Kowalik, Gdafisk, Poland V.V.N. Murty, Bangkok, Thailand

R.J. Reginato, Phoenix, AZ, U.S.A. D.A. Rose, Newcastle-upon-Tyne, Great Britain J. Shalhevet, Bet Dagan, Israel Shi Yuang-chung, Beijing, P.R. China V.P. Singh, Baton Rouge, LA, U.S.A. R.W. Skaggs, Raleigh, NC, U.S.A. M. Smith, Rome, Italy S.J. Smith, Durant, OK, U.S.A. D.L. Suarez, Riverside, CA, U.S.A. T. Talsma, Canberra, A.C.T., Australia P. Widmoser, Kiel, Fed. Rep. of Germany P.J. Wierenga, Las Cruces, NM, U.S.A. E.G. Youngs, Harpenden, Great Britain

VOLUME 17 (1990)

ELSEVIER, AMSTERDAM-OXFORD-NEW YORK-TOKYO