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Annals of Botany 82: 497-505, 1998
© 1998 Annals of Botany Company

Use of the Expolinear Growth Model to Analyse the Growth of Faba bean, Peas and Lentils at Three Densities: Fitting the Model

K. H. M. ISHAG and M. D. DENNETT+,

Department of Agricultural Botany, School of Plant Sciences, The University of Reading, PO Box 221, Whiteknights, Reading, RG6 6AS, UK

March 4, 1998 ; April 7, 1998 . June 5, 1998 .

The expolinear equation for crop growth (Goudriaan and MonteithAnnals of Botany66: 695–701, 1990) was fitted to measurements of above ground dry weight made on two cultivars of each of three species, faba bean (Vicia fabaL.), peas (Pisum sativumL.) and lentils (Lens culinarsMedic.), each grown at three densities at the University of Reading, UK in 1992 and 1993. The expolinear equation fitted the data well but required frequent sampling to obtain good estimates of the parameters. The equation has three parameters,Rmthe maximum relative growth rate,Cma maximum crop growth rate, andtbthe time at which the crop effectively reaches a linear phase of growth.Rmdid not differ between densities, cultivars or species but differed between years.Cmincreased with increased density and was lower for lentils than for faba beans or peas.tbdecreased with increased density for faba bean but not for the other species. Incorporating an extinction coefficient for solar radiation and the maximum fraction of radiation intercepted enabled reasonably accurate time courses of leaf area index to be derived, as suggested by Goudriaan (1994. In: Montieth JL, Scott RK, Unsworth MH, eds.Resource capture by crops. Nottingham: Nottingham University Press, 99–110).Copyright 1998 Annals of Botany Company

Expolinear equation, grain legumes, crop growth rate, crop density, relative growth rate, growth modelling, faba bean,Vicia fabaL., peas,Pisum sativumL., lentils,Lens culinarsMedic.


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