Data from a field experiment carried out on growth of lettuce, onion and red beet were used (a) to fit logistic, Gompertz, expolinear and 'Scaife and Jones' (1976) functions using time, day-degrees and effective day-degrees and (b) to test a mechanistically-based model that combines the effects of potentially limiting variables such as temperature and light and allows for plant zone area in light interception (Aikman and Benjamin, 1994). The use of day-degrees and effective day-degrees instead of time, in general, improved the fit and gave a better estimate of growth parameters. The best fit was obtained by the Gompertz function for lettuce and by the expolinear function for red beet and for onion. The expolinear function seemed the most reliable function in estimating the early relative growth rate that is the crucial value in all the mechanistic models. The zone area model showed very good simulations for lettuce and red beet but it requires a modification for canopy senescence in onion.

Growth of lettuce, onion, and red beet. 2. Growth modelling.

TEI, Francesco;
1996

Abstract

Data from a field experiment carried out on growth of lettuce, onion and red beet were used (a) to fit logistic, Gompertz, expolinear and 'Scaife and Jones' (1976) functions using time, day-degrees and effective day-degrees and (b) to test a mechanistically-based model that combines the effects of potentially limiting variables such as temperature and light and allows for plant zone area in light interception (Aikman and Benjamin, 1994). The use of day-degrees and effective day-degrees instead of time, in general, improved the fit and gave a better estimate of growth parameters. The best fit was obtained by the Gompertz function for lettuce and by the expolinear function for red beet and for onion. The expolinear function seemed the most reliable function in estimating the early relative growth rate that is the crucial value in all the mechanistic models. The zone area model showed very good simulations for lettuce and red beet but it requires a modification for canopy senescence in onion.
1996
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/110506
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