|Authors: ||C.A. Cardenas-Méndez, I.F. Rivera-Gomez, V.J. Florez-Roncancio, B. Chaves-Cordoba, W. Piedrahita-Canola|
|Keywords: ||logistic growth model, RGR, burned rice husk, coconut fiber, soilless culture|
It is of particular interest for the Colombian cut flower growers to characterize the physiological behavior of crops, which are economically important using substrates.
The objective of this research was to generate mathematical growth curves over time and to determine different growth indexes of carnation cv. ‘Nelson’ grown in soilless cultures using 100, 65 and 35% burned rice husk substrate complemented with coconut fiber.
The research was carried out in the Bogotá plateau under plastic greenhouse conditions.
Growth curves obtained from crop samples were adjusted by a logistic growth model and the indexes leaf area index, net assimilation rate, crop growth rate, relative growth rate, specific leaf area and leaf weight ratio were determined.
Carnation plants established in the different substrates did not present significant differences in total dry mass.
However, the plants grown in burned rice husk accumulated a significant greater leaf dry mass, whereas plants in mixtures had a significant accumulation of stem dry mass.
These plants in mixtures reached the maximum absolute growth rate for leaf area and leaf dry mass significantly earlier.
The greatest values of relative growth rate obtained from plants grown in burned rice husk were more influenced by the specific leaf area and the leaf weight ratio than the net assimilation rate.
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