Abstract
The objective of this work was to evaluate the phytotoxic effect of Brachiaria decumbens Stapf. on the morphometry of Eucalyptus urograndis plants, genetically modified hybrid of Eucalyptus urophylla S. T. Blake × Eucalyptus grandis W. Hill ex Maiden. Pots containing the eucalyptus plants were conditioned in protected environments in a completely randomized experimental design. The treatments were composed of aqueous extract of Brachiaria decumbens grass at different concentrations: 0% (control, distilled water only), 20%, 40%, 60%, 80% and 100% (g/L). On day 30 of the experiment, the following morphological parameters of the plants were evaluated: aerial part height, diameter of stem, aerial dry mass, root dry mass, total dry mass, and robustness index. The data were submitted to analysis of variance at the 5% level of significance, and a regression equation was constructed for the quantitative treatments. The results indicated that the Brachiaria decumbens grass extract did not have an inhibitory effect on aerial part height and robustness index. However, the extract at concentrations higher than 20% had negative effects on root dry mass, aerial dry mass, and total dry mass. For the diameter of the stem, only concentrations above 60% had an inhibitory effect.
Highlights
In recent years, the silvopastoral systems (SPS), one of the modalities of agroforestry systems, have attracted a great number of followers in the search to promote sustainable land use
Agricultural models aimed at the diversification of production, increase and better distribution of income over time, soil and water conservation, thermal comfort for animals, improvement of forage nutritional value and others are obtained through agroforestry (Oliveira Neto & Paiva, 2010)
The extract of brachiaria grass not influenced the eucalyptus plant’s height of the aerial part (H) and index of robustness (IR), indicating that there was no response by the eucalyptus plants to the different levels of extract used in this study
Summary
The silvopastoral systems (SPS), one of the modalities of agroforestry systems, have attracted a great number of followers in the search to promote sustainable land use. Because it encompasses more than one productive component, special attention should be given to the planning phase. The SPS is the intentional combination of trees, pastures and animals in the same area and at the same time, managed in an integrated way (Silva et al, 2010), and has been become more widely used in recent years
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