Status nutricional de diferentes materiais genéticos de Eucalyptus sp. plantados em Dois Vizinhos-PR

Abstract

The planted and native forests are an important heritage of Brazil. The aim of this study was to evaluate the nutritional status of different genetic materials of Eucalyptus sp. (including species, hybrids and clones) planted in Dois Vizinhos-PR and identify possible deficiencies and nutritional influences on the development of these species. With an emphasis on evaluating of the genetic adaptation of these materials in the Southwest Region of Paraná. The project was implemented, called TUME (Eucalyptus Multiple Use Test), in the Unity of Learning and Research in Planted Forest of the UTFPR –Câmpus Dois Vizinhos. The TUME was implemented with the use of 14 different genetic materials of Eucalyptus sp., in demonstration plots each containing 160 plants, planted at 3 m x 2 m spacing. The nutritional status of different genetic materials was evaluated in two ages, 12 months and 31 months of old, with use of leaf analyzes. The results showed that: the nutrients that can limit the growth of different species of Eucalyptus sp., are P and K, these nutrients are in deficient level. The N, at 12 months of age was higher for clone GFMO-27 and smaller in E. pellita x terecticornis, E. robusta, E. pellita and E. exserta. At the 31 month of old, the E. urophylla clone floração and E. exserta were genetic materials with the highest levels of N in the leaf tissue, in contrast, the lowest levels were found in E. pellita x terecticornis aind E. robusta. The Ca and Mg are high for all the genetic materials. The different genetic materials showed decrease average leaf content, with the following sequence: N > Ca > Mg > K > P. Genetic materials that present the best results are clones and hybrids, especially clone H-13, E. saligna x botryoides, E. urophylla clone floração, clone GFMO-27, clone I-224 and E. grandis x camaldulensis. In this context, clones and hybrids has excelled as the greatest potential for growth and adaptation to soil and climate of the southwest region of Paraná and greater nutritional requirement.