Alternative methods for weed competition control in an agroforestry system with cacao in the Amazon biome
DOI:
https://doi.org/10.37002/biodiversidadebrasileira.v15i1.2677Keywords:
Planting crown , textile mulch , Theobroma cacao , weedsAbstract
Weed control is one of the main demands in the initial management of Theobroma cacao L. plants in the Amazon region. Thus, the objective of this study was to evaluate the effect of different physical methods in the crowning of clonal cacao seedlings in an agroforestry system as a strategy for weed control. The experiment was conducted in an area belonging to the Rancho Pioneiros Company, in the municipality of Parauapebas, Pará, using a randomized block design, with a spacing of 3 m x 3 m. The treatments applied to the crown of the seedlings were: Control (T1); conventional weeding (T2); textile mat (T3); straw (T4); wood shavings (T5); cardboard (T6); double-sided tarp (T7); and planting crown (T8). The textile mat (T3) was made of jute enriched with fertilizer and pre-emergent herbicide. At 90 days after planting, the survival, height, stem diameter, and Falker chlorophyll index a (ICFa) and b (ICFb) of the seedlings were evaluated, as well as the weed biomass in the crown. Seedling survival and initial growth were not influenced by the treatments. However, the use of straw and manual crowning resulted in higher ICFa and ICFb values, indicating better physiological conditions, which can promote greater plant growth. The alternative methods tested showed great potential for weed suppression, being an efficient strategy for weed control and favorable for the physiological conditioning of the initial establishment of cacao tree in agroforestry systems.
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