Abstract
The aims of this study was to evaluate the dry matter production in different parts of cupuassu plant (Theobroma grandiflorum), such as leaves, stems, primary and secondary branches in progenies resistant to pests and diseases (Codajás and Manacapuru) in function of the plant age, through the application of multivariate statistical analysis. The experiment was conducted at Embrapa Amazônia Oriental for a period of four years, in a randomized design. Samples were taken of five trees of each progeny, resulting in a total of 40 plants, which were separated into leaves, stems, primary and secondary branches. In each group of variables, the assumptions of canonical correlation analysis were tested, such as multivariate normal, the homoscedasticity deviations, multicollinearity, linearity in the dry mass of plant parts and correlation matrices that test the significance of the experimental data. Plants of PMI186 and PMI215 showed significant canonical correlations between the most variable groups of leaves, stems, primary branches and secondary branches, indicating that the groups are not considered independent, showing a linear relationship between them. In the dry matter of leaves, stems, primary and secondary branches index showed a high degree of significance for the Pearson test when related to parts of cupuassu plants. The largest production of total dry matter was obtained in PMI186 with 4332.92 g plant-1 in secondary branches (4th year) and the lowest production showed in PMI215 with 4086.26 g plant-1 in the secondary branch (4th year). Key words: Linear relationships, vegetative growth, cluster analysis.
Highlights
The largest production of total dry matter was obtained in PMI186 with 4332.92 g plant-1 in secondary branches (4th year) and the lowest production showed in PMI215 with 4086.26 g plant-1 in the secondary branch (4th year)
The cupuassu plant (Theobroma grandiflorum) shows social and economic importance in the state of Pará, especially in family farming in areas that has been improving their farms, with the introduction of consortium systems with other fruit trees, or through the introduction of agro-forestry systems involving planting a tree species, Afr
The introduction of tree species in future shows as selling wood and seeds, while cupuassu plant are included as part of the system, enabling farmers to have the economic profitability in the short term, while the timber species is in vegetative development, producing shading for cupuassu (Vieira et al, 2007)
Summary
The cupuassu plant (Theobroma grandiflorum) shows social and economic importance in the state of Pará, especially in family farming in areas that has been improving their farms, with the introduction of consortium systems with other fruit trees, or through the introduction of agro-forestry systems involving planting a tree species, Afr. J. Such as mahogany intercropped with cupuassu and other fruit trees (Vieira et al, 2007). In addition of high economic and social importance in the Amazon region, there is little research on the agronomic performance of cupuassu, limiting the expansion of the cultivated area in the region (Alfaia and Ayres, 2004). As a result of most soils in which the plantations are established in the Amazon region having low fertility (Vale Júnior et al, 2011), a research that takes into account this situation is needed to be carried out
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