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Cuiabá, Brazil

The stumps of thinning trees of Tectona grandis L.f. present intense sprouts that compete with the remaining trees. The efficacy of the control of sprouts with the herbicides picloram and triclopyr, associated or no it applications of physical damages, were evaluated. Immediately after thinning, in plantation with four years old, the stumps were treated, and in other plantation, with age of six, the sprouts of stumps thinned in the previous year, were treated. The percentage of died stumps, the number of sprouts by stump and the respective heights were registered. In the first trial, the combined application of picloram at 0.48% with triclopyr at 0.96%, associated a 20 cracks with axe killed all stumps. In the second trial, the best efficacy, 21.7%, was obtained with the previous mowing of sprouts and application of picloram at 0.96%. After thinning, the isolated application of picloram or combined with triclopyr, associates or not a physical damage is efficient to control sprouts of teak. The application in the sprouts of stumps thinned in the last year present any efficiency, with least percentage of dead stumps in relation to application after thinning. Source


Rossi A.S.,Federal University of Mato Grosso | Drescher R.,FENF | Pelissari A.L.,Mestrando Do Programa de Pos Graduacao em Ciencias Florestais e Ambientais | Lanssanova L.R.,Mestrando Do Programa de Pos Graduacao em Ciencias Florestais e Ambientais
Scientia Forestalis/Forest Sciences | Year: 2011

The objective was to fit models of hypsometric relationship and evaluate the growth of teak (Tectona grandis L.f.) in the municipality of Monte Dourado, State of Pará, Brazil. Data were collected from temporary plots of 30 m × 20 m in stands aged between 1 to 5 years and 26 years. A total of 10 hypsometric models were fitted and the selection criteria followed the lowest standard error of estimate, the highest adjusted coefficient of determination and absence of tendencies in the graphical analysis of residues. For stem analysis, 10 dominant trees were selected in the 26-yr old stand from which discs at 0.10 m, 0.70 m, 1.30 m and at distances of one meter along the stem. The equation √H-1,30=0,173+2,211.DAP-2,216.DAP2presented the best fit, while growth was similar or higher than the plantations in Africa and Asia. Source


Donadoni A.X.,Federal University of Mato Grosso | Pelissari A.L.,FENF | Drescher R.,FENF | da Rosa G.D.,Federal University of Mato Grosso
Ciencia Rural | Year: 2010

The commercial plantings of Pinus were established in Brazil for over 30 years, initially in the South and Southeast. However, with the introduction of tropical species, became feasible in the whole country. Considering the importance of obtaining parameters to assess growth and the potential production of Pinus, the present work aims to adjust traditional models of hypsometric relation to species Pinus caribaea Morrelet var. hondurensis Barret & Golfari and Pinus tecunumanii Eguiluz & Perry, in pure stand, in the municipality of Vilhena, Rondônia State. Ten models were adjusted and the selection criteria followed the lower standard error of estimate (Syx%), higher adjusted coefficient of determination (R2aj.), F value and regression coefficients significant and graphical analysis of the residues. The model d/√h=β0 + β1.d + εi showed the better fit, with R2aj of 0,896 and Syx% of 3,941% for P. caribaea var. hondurensis and R2aj.of 0,973 and Syx% of 6,319% for P. tecunumanii. Source


da Conceicao F.X.,Federal University of Mato Grosso | Drescher R.,FENF | Pelissari A.L.,Federal University of Parana | Lanssanova L.R.,FENF | And 2 more authors.
Ciencia Rural | Year: 2012

The study aims to determine the local productive capacity of teak in Monte Dourado, Pará State, Brazil, with the analysis of site index curves. The data were obtained by stem analysis of ten dominant trees in a stand with 26 years of age. Were adjusted ten regression models and the criterion for selection followed the lowest standard error of estimate, the highest adjusted coefficient of determination, the significance of F test and of regression coefficients and graphical analysis of the residuals. The site index curveswere built by the guide-curve method. The Spillman model present the best fit, by which were generated three curves of site index from 16m to 24m, at 26 years of index-age. The region of Monte Dourado - PA showed a productive potential for the development of teak. Source

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