Effect of the re-growth age on the primary metabolites of Tithonia diversifolia, part 2: Sugars metabolism.

In this communication we carried a research in order to establish mathematical expressions that relate the regrowth age with the sugar content (glucose, fructose and sucrose) of the whole plant and its fractions. The experiment was developed, following a randomized block design, with 5 treatments (60, 90, 120, 150 and 180 d). In the first part of this communication the content of Nitrogen (N) in the integral plant, leaves and stems were evaluated. Reporting that Glu, Frut and Suc decreased with the highest results at 60 days and quadratic and cubic equations with R2 higher than 0.90 were adjusted.