Estabelecimento inicial de Tectona grandis L. f em plantios tardios com polímero hidrorretentor seco

Abstract

Because of its economic importance Tectona grandis is among the main species planted in tropical countries. In Brazil, it is cultivated mainly in homogeneous plantations. However, the establishment of planted forests presents the problem of replanting, due to the low survival rate of the seedlings, associated mainly to water deficiency in the dry period. In order to understand the dynamics of teak development in forest plantations, this project was carried out, which is divided into two chapters. In Chapter 1, we aimed to validate and determine the best estimate equation (s) of the leaf area, considering two cultivation conditions: homogeneous planting and isolated plants; And three positions of the leaves in the crown (upper, middle and lower third). The results demonstrated that the teak leaf area (LA) can be obtained based on the product of leaf length and width, irrespective of crop condition and leaf position in the plant (AF = 0.5776 CL) or based on Dry mass (AF = 91.9164 MS). In Chapter 2 we aimed to evaluate the effect of different doses of water-retaining polymer in the initial establishment of T. grandis in late plantings, in a dystrophic Red-Yellow Latosol based on the results it is possible to affirm the use of water-retaining polymers has a positive effect on the survival and growth of teak seedlings in post-planting and the application of 3 g.pit-1 of water-retaining polymer increases the increase of height and fresh epigene phytomass.