Use of modeling for studying the growth of Tithonia diversifolia collection 10
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Abstract
collection 10 of Tithonia diversifolia, through the use of different statistical criteria and to determine the models of best goodness of
fit test. The indicators were determined every 14 d for 18 weeks, when cutting in each of those moments for each season. The seedling
height (cm), weight of 100 leaves green matter (g) (weight 100 L GM), weight of the integral plant green matter (g) (weight IP GM),
total weight of a linear meter (g) green matter (total weight 1 m GM) were studied in two moment of 2006 and 2007, in the periods
June-October and January-June, respectively. The variables expressed in DM did not have proper goodness of fit in the models used.
The Richards model was not adequate for describing the performance of the variables studied. In the rainy season, the model of best
fit for the seedling height was the model of Gompertz, while the weight of 100 leaves GM, weight of the IP GM and total weight of
1 m GM showed square fits. The variable seedling height reached 175.23 cm of superior value in week 18, with weekly growth rate of
0.14 cm. The weight of 100 leaves GM and that of the integral plant had maximum values at 12 weeks, with 282.47 g and 133.99 g,
respectively. The rest of the variables of weight and the total weight 1 m showed maximum values in week 12, with a Little bit more
of 6000 g. During the dry season, there were no significant fits for most of the variables under study. The linear fit was considered for the seedling height; although its statistical significance was lower than 0.05. Only the weight of 100 leaves GM had significant fit to the exponential model. It is concluded that Tithonia diversifolia, green material 10, had the best growth characteristics during the rainy season up to week 12. However, there was no stability of the indicators under study in the dry season. The results show conditions
for developing further studies, related with biomass? production, even for cutting or for grazing, when knowing the performance of different plant components in time.
Key words: growth, modeling, Tithonia diversifolia
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