Publication Date
1997
Description
Aqueous extracts at 10% were prepared with the shoots of the grasses Brachiaria brizantha cv. Marandú, B. decumbens, B. humidicola, and of the legumes Calopogonium mucunoides, Leucaena leucocephala, Stylosanthes guianensis cv. Mineirão. The effects of the extracts were evaluated on the germination and on the radicleelongation of the forages. The pH, the electric conductivity and the osmotic potential of the extracts were determined. The germination and radicle biossays were conducted in germination chambers, with controlled temperature and photoperiod. The pH and the presence of ions did not contribute to the effects observed. The extracts of the legumes tended to reduce the growth of the grasses to a greater extent than the grasses reduced the growth of the legumes. The radicle-elongation was a more sensitive indicator to evaluate the effects of the extracts than the germination (%). The C. mucunoides was the legume with higher allelopathic effect, while among the grasses there was not a remarkable species.
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Allelopathic Interactions Among Forage Grasses and Legumes
Aqueous extracts at 10% were prepared with the shoots of the grasses Brachiaria brizantha cv. Marandú, B. decumbens, B. humidicola, and of the legumes Calopogonium mucunoides, Leucaena leucocephala, Stylosanthes guianensis cv. Mineirão. The effects of the extracts were evaluated on the germination and on the radicleelongation of the forages. The pH, the electric conductivity and the osmotic potential of the extracts were determined. The germination and radicle biossays were conducted in germination chambers, with controlled temperature and photoperiod. The pH and the presence of ions did not contribute to the effects observed. The extracts of the legumes tended to reduce the growth of the grasses to a greater extent than the grasses reduced the growth of the legumes. The radicle-elongation was a more sensitive indicator to evaluate the effects of the extracts than the germination (%). The C. mucunoides was the legume with higher allelopathic effect, while among the grasses there was not a remarkable species.
