Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2003.605.612AliMansab Daniel L. Jeffers Paul R. Henderlong 8200328A field study of soybean (Glycine max L. Merr.) relay intercropped with winter wheat (Triticum aestivum L.) was designed to test the hypothesis that growth of wheat-soybean system depends on relative plant density and amount of light intercepted by each crop. Intercrop soybean did not influence leaf area index (LAI) and dry matter accumulation (DMA) of intercropped wheat compared with monocrop wheat because intercrop soybean was not large enough during the competitive period to disrupt wheat growth. However, intercrop wheat altered the soybean LAI, DMA and crop growth rate (CGR) compared with monocrop soybean. Leaf growth and increase in photosynthetically active radiation (PAR) intercepted by soybean was slow in the intercrop compared to monocrop soybean during early stages but the rate increased during late sample periods. Monocrop soybean approached 95% PAR interception and the rate of increase slowed as the monocrop approached a critical LAI 4.0. Among the intercrops; alternate narrow rows was more efficient than wide rows in the amount of PAR intercepted per unit of LAI and CGR per unit of relative PAR interception. Crop growth rate of intercrop soybean was linearly related to PAR interception, but rates remained below those for monoculture.]]>Ali, M.,19901990Athow, K.L., F.A. Laviolette, J.R. Wilcox and T.S. Abney,198727365365Bernard, R.L. and C.R. Cremeens,198222688688Bernard, R. L. and C. R. Cremeens,19882810271027Beuerlein, J.,19871987Bureau, M.F., T.E. Grabaw and R.J. Scherzinger,1984Gardiner, T.R., D.M. Vietor and L.E. Craker,197959191199Gardner, F.P., R.B. Pearce and R.L. Mitchell,19852nd Edn.,Hay, R.K.M. and A.J. Walker,19891st Edn.,Jeffers. D.L. and G.B. Triplett,1979646770Natarajan, M. and R.W. Willey,1985104263270Parvez, A.Q., F.P. Gardner and K.J. Boote,198929150157SAS Institute,1985Shibles, R.M. and C.R. Weber,19655 575577Thimijan, R.W. and R.D. Heins,198318818822Waston, D.J.,1947114776Wilson, J.W.,198148507512Zadoks, J.C., T.T. Chang and C.F. Konzak,197414415421Andrew, D.J. and A.H. Kassam,19761976pp: 1-10pp: 1-10