Agricultural and Forest Meteorology, 44 (1988) 175-186 175 Elsevier Science Publishers B.V., Amsterdam -- Printed in The Netherlands INTERCEPTION AND USE EFFICIENCY OF LIGHT IN WINTER WHEAT UNDER DIFFERENT NITROGEN REGIMES*'** RICHARD GARCIA Center for Agricultural Meteorology and Climatology, University of Nebraska, Lincoln, NE 68583-0728 (U.S.A.) EDWARD T. KANEMASU Evapotranspiration Laboratory, Kansas State University, Manhattan, KS 66506 (U.S.A.) BLAINE L. BLAD Center for Agricultural Meteorology and Climatology, University of Nebraska, Lincoln, NE 68583-0728 (U.S.A.) ARMAND BAUER USDA-ARS, Northern Great Plains Research Laboratory, Mandan, ND 58554 (U.S.A.) JERRY L. HATFIELD USDA-ARS, Cropping Systems Research Laboratory, Lubbock, TX 79401 (U.S.A.) DAVID J. MAJOR Agriculture Canada, Lethbridge, Alberta, TIJ 4B1 (Canada) ROBERT J. REGINATO USDA-ARS, U.S. Water Conservation Laboratory, Phoenix, AZ 85040 (U.S.A.) KENNETH G. HUBBARD Center [or Agricultural Meteorology and Climatology, University of Nebraska, Lincoln, NE 68583-0728 (U.S.A.) (Received October 2, 1987; revision accepted June 8, 1988) ABSTRACT Garcia, R., Kanemasu, E.T., Blad, B.L., Bauer, A., Hatfield, J.L., Major, D.J., Reginato, R.J. and Hubbard, K.G., 1988. Interception and use efficiency of light in winter wheat under different nitrogen regimes. Agric. For. Meteorol., 44: 175-186. In an identical experiment conducted at Mandan (ND), Manhattan (KS) and Lubbock (TX), *Funding for this study was provided by the Agricultural Research Service, U.S. Department of Agriculture, Kansas Agricultural Experiment Station, University of Nebraska Agricultural Re- search Division, Agriculture Canada, and the National Science Foundation; Grant Number ATM- 8417995. **Contribution No. 88-487-5 from the Kansas Agricultural Experiment Station, Manhattan, KS 66506. 0168-1923/88/$03.50 © 1988 Elsevier Science Publishers B.V.