Potential of two cover crops, signal grass and ruzi grass: suggested allelopathic effect on some important weeds

• DOI: 10.21475/ajcs.21.15.02.p2958
• Publication Date: 2021-05-17T07:15:09Z
• Authors: André Luís Gnacca...; Rodrigo Martinelli; Thiago Ferreira Z...; Luiz Renato Rufin...; Patricia Andrea M...; Patrícia Marluci ...; Fernando Alves de...
• Keywords: Allelopathy

There is evidence that signal (SG) and ruzi (RG) grass have an allelopathic effect on weeds. This study aim to evaluate this effects difficult-to-control weeds: hairy beggarticks (HB), benghal dayflower (BD), horseweed (H), sourgrass (S) tall windmill (TWG). The first experiment was installed in a completely randomized design with 2 donor species (SG RG) × 4 extract concentrations (0, 75, 150 225 mg ml−1) factorial scheme four replicates. Weed germination percentage evaluated three-day intervals. In the second experiment, weeds emerged substrates previously cultivated SG RG, randomised block emergence, shoot growth root were evaluated. results as follows: (i) 84% inhibition by RG leaf extracts 38% emergence exudates observed; (ii) 37% 4.3 times SRL values than control exudates; (iii) (HB) 52% scored, while reduced 43% of 24% shoots biomass accumulation 11.3% length; (iv) 71% both plants 75% measured. Finally, (TWG) 69% observed upon using plants. It can be concluded foliar allelochemicals inhibit of: BD > S TWG H HB, exudate allelochemicals, development all