Influência do tamanho da parcela experimental em testes clonais de eucalipto
A base da silvicultura clonal para o gênero Eucalyptus está na utilização de clones de alta produtividade, normalmente identificados nas avaliações dos testes clonais. Em geral, quanto maior o número de clones avaliados por unidade de tempo, maior a possibilidade de sucesso com a seleção. Entretanto...
|Nível de Acesso:||openAccess|
Universidade Federal de Viçosa
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|Citação:||SILVA, Rogério Luiz da. Influência do tamanho da parcela experimental em testes clonais de eucalipto. 2001. 63 f. Dissertação (Mestrado em Ciência Florestal) - Universidade Federal de Viçosa, Viçosa. 2001.|
|Resumo inglês:||The base of clonal forestry for the Eucalyptus gender is the use of high production clones, normally identified in clonal test evaluations. In general, the higher the number of evaluated clones per time unit, the greater the possibility of a successful selection. However, the evaluation and selection stages are the most expensive and time-consuming of the enhancement program, creating difficulties for working out and carrying out extensive clone selection programs. Therefore, the present study had the objectives: evaluation of age influence, spacing and site on the experimental parcel size in clonal tests, considering the coefficient of variation experimental, the coefficient of variation phenotype and the volume productivity, as well as the determination of the experimental parcel size, by means of the Maximum Modified Curvation, the Interclass Correlation coefficient and Visual Analysis methods. Based on four clonal tests, established in the area of International Paper of Brazil Ltda., the characteristics height, diameter at breast height and volume were tested in the four clonal tests, set up in design of random blocks in four repetitions, in experimental square parcels of 25 plants (5x5). After the simulation of different parcel sizes: 2, 3, 4, 5, 10, 15, 20 and 25 plants/parcel, the influence of the parcel size on the productivity, the experimental accuracy and the variation of the phenotype coefficient were tested. The parcel size was also determined by the Maximum Modified Curvation, the Interclass Correlation Coefficient and the Visual Analysis methods. In the main, the parcel size did not influence the volume production estimative of the clones at the different analyzed ages. However, the coefficient of variation experimental (CV exp ) and the coefficient of variation phenotype (CV ph ) presented higher values at more advanced ages, with a sinking tendency when the number of plants in the parcel was reduced, independent of the age. The plant spacing can change the parcel size, since the greater the spacing, the lower the CV exp and CV ph . The parcel behavior was little influenced by the evaluations performed in the different sites. The minimum size of the experimental parcel indicated by the Maximum Modified Curvation and the Interclass Correlation Coefficient methods ranged from 1 to 8.6 plants per parcel, while for the Visual Analysis it varied from 5 to 15 plants per parcel in the different clone tests and the analyzed characteristics. Based on the present study, the conclusion can be drawn that in initial clone selection programs, parcels of 5 to 10 plants provide good experimental accuracy, especially recommended when there is only a limited number of seedlings available, a high number of test clones and evaluations of preliminary type and at an early age. However, it must be emphasized that in order to obtain more knowledge about a clone for commercial use, larger square parcels and/or, pilot plantings are the most indicated.|