The objective of this work was to evaluate the interference resulting from the use of different phytomass quantities of Uroclhoa brizantha cv. Marandu and the management of straw to control beggar-ticks (Bidens subalternans). The experiment was performed under greenhouse from May to August, 2014, using a randomized block experimental design with four replicates, in a factorial scheme (3 × 4) + 1, with Factor A constituted by three management methods (incorporated, incorporated+surface and surface), and Factor B constituted by five straw levels (3; 6; 9 and 12 t ha-1), plus one treatment without the usage of any cover plant (control treatment). The variables evaluated were the total number of plants emerged, the index of emergence velocity, dry phytomass of the aerial plant portion, leaf area, dry phytomass of roots and the volume of roots. Different management methods at different straw levels were efficient, with an emphasis to the surface management in the suppression of beggar-ticks (B. subalternans).
Key words: Allelopathy, beggar-tick, Brachiaria brizantha, weed
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