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Influence of trinexapac-ethyl on the initial growth of eucalyptus

Grant number: 12/04437-1
Support type:Scholarships in Brazil - Master
Effective date (Start): August 01, 2012
Effective date (End): July 31, 2014
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:Pedro Luis da Costa Aguiar Alves
Grantee:Rodrigo Neto Pires
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

In order to evaluate the effect of increasing doses of ethyl-trinexapac on the characteristics of growth and development of seedlings and trees of eucalyptus (E. urograndis) will be carried out two experiments. At first, treatments are arranged in a factorial 2 x 7 with two modes of application for six doses (0.01, 0.02, 0.03, 0.04, 0.05, 0.06 L i.a. ha-1) and a control without application, totaling 140 plots, following the completely randomized design with four replications. The second experiment will be installed in the field and based on the mode of application and subdose (s) established in the first experiment. Treatment will be done in the pre-planting of eucalyptus trees, leaving a lot without this treatment. Following may be held up to three sequential applications of a single dose of maturing in time, namely three, six and nine months after planting, and combinations thereof, totaling 16 treatments. The experimental design to be adopted is a randomized complete block with treatments in the subplot, in which the two parcels constitute pre-planting treatments (with and without trinexapac-ethyl) and subplots to three sequential applications of a single dose of the maturing time. In both experiments, during the application , plants will be evaluated for height and stem diameter. In experiment 1, 7, 15, 30, 60, and 90 days after planting (DAP), seedlings will be evaluated in terms of height, stem diameter, leaf number, leaf area, root volume, dry mass of leaves, stem and roots. These evaluations may be supplemented by determinations of the total chlorophyll content, quantum efficiency of photosystem II (Fv / Fm) and the efficiency of water use, to be held on the third fully expanded leaf previously marked. In experiment 2, at 360 DAP, a plant is characterized by the height, stem diameter, dry mass of stems and leaves and leaf area. In either be accompanied, described and recorded photographically possible morphophysiological changes in plants resulting from experimental treatments. The results will be submitted to regression analysis, analysis of variance by F test and the averages are compared by Tukey test at 5% probability.