Crecimiento en plantas jóvenes de Aspidosperma quebracho-blanco Schlecht

Abstract

Alzugaray, C.; N. J. Carnevale y A. R. Salinas, 2006. ?Growth in young trees of Aspidosperma quebracho-blanco Schlecht?. Lilloa 43 (1-2). A. quebracho-blanco is one of the typical trees of the Chaco Province. The objetive of this study was to evaluate the growth of young trees in two types of soils, Vertic Argiudol (VA) and Typical Natraqualf (TN), at the end of three growing periods: 9, 21 and 33 months. The variables observed were: leaf area (LA), total dry matter (TDM), root dry matter (RDM), shoot dry matter (SDM), root total length (RTL), height (H) and root depth (RD). Was calculated the root mass ratio (RMR), the stem mass ratio (SMR), the leaf area ratio (LAR), the root length ratio (RLR), the specific root length ratio (SRLR), the relative growth rates (RGR), the net assimilation rate (NAR), and the percentage of increase in dry matter (IDM) in young trees in comparison to seed dry matter (= 100%). Nine month old A. quebracho-blanco plants were found to have higher RD and RTL in soil AV (p< 0.05). LA, TDM, RDM and RTL were higher in 21 and 33 month old plants in soil VA (p< 0.05). RGR, NAR and IDM were higher (p< 0.05) in 33 month-old plants growth in VA, with values of 0.23 mg.g-1.day-1; 0.058 mg.cm2.day-1 and 13.643%, respectively. According to these results, A. quebracho-blanco positively responds to Vertic Argiudol soil.