Abstract
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
Highlights
Bidens subalternans, commonly known as beggar-ticks, occurs in several agricultural regions in Brazil (Gazziero et al, 1998)
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, 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
The experimental was designed under random blocks, with four replicates in a factorial scheme (3 × 4) + 1, with Factor A constituted by three methods of management and Factor B constituted by five straw levels (3; 6; 9 and 12 t ha-1), plus one treatment without the use of any cover plant, with a total of 52 experimental units
Summary
Commonly known as beggar-ticks, occurs in several agricultural regions in Brazil (Gazziero et al, 1998). Its existence was little mentioned, probably due to the fact of the species being similar to Bidens pilosa, being basically differentiated by the number of beards in the achenes (Kissmann and Groth, 1993). In numerous areas its occurrence has significantly increased and, in many farm properties within the Brazilian States of Mato Grosso and the northern region of Mato Grosso do Sul, the infestation is greater than the one observed for B. pilosa (Sanches and Zandonade, 1997). Its resistance to ALS inhibitors was reported by Monqueiro et al (2000).
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