Abstract

VEGA ROJAS, Tatiana; MENDEZ SOTO, Carlos  and  RODRIGUEZ MONTERO, Werner. Plant growth analysis of five hybrids of carrot (Daucus carota L.) by functional analysis methodology. Agron. Costarricense [online]. 2012, vol.36, n.2, pp.29-46. ISSN 0377-9424.

Plant growth analysis of 5 hybrids of carrot (Daucus carota L.) was conducted in Cipreses, Oreamuno, Cartago, with the aim to describe the phenology and growth of carrot. Growth analysis was performed using the methodology of functional analysis. The leaf area and the dry weight of each organ and total plant were evaluated, non-linear regression models were adjusted for these variables, the parameters that define the mathematical functions that best describe the growth were obtained and each model was plotted for each variable evaluated. The roots and total dry weight variables were adjusted to an asymptotic nonlinear logistic function: PS=alpha/(1+exp (-beta (x-gamma))); the leaves dry weight and the leaf area were adjusted into the belltype function: PS=alpha*exp (-beta (x-gamma)2). Plants showed a sigmoidal growth curve with well-defined stages: a slow growth phase, then an exponential growth segment, followed by a period of reduced growth and finally a stage of stability. The plant spends its early stages of development establishing the photosynthetic machinery, indirect competition with radical development. The root begins to thicken between 63-77 dap, during the second phase of growth, with a greater proportion of assimilates allocated to the root, leading to an increase in its diameter. Finally, from the analysis of the variables of total dry weight and leaf area, 2 groups can be established: on the one side Supreme, Esperanza and Bangor, and on the other CLX-3193 andSirkana. The first group showed the highest values for such variables.

Keywords : Zanahoria; híbridos; análisis de crecimiento; fenología; Carrot; hybrids; plant growth analysis; phenology.

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