Theme 02: Grass-Legume Mixtures

Description

The available information about allelopathic effects of the genus Panicum on tropical forage legumes is scarce and inconclusive. Based on this fact this research was carried out, under greenhouse conditions to evaluate potential allelopathic effects of aqueous extracts (0,10 and 20%) of three cultivars of Panicum maximum Jacq. cv. Mombaça, cv. Aruana and cv. Tanzânia-1 on three forage legumes, Leucaena leucocephala (Lam.) de Wit. (leucaena), Cajanus cajan (L.) Millsp. cv. Kaki (pigeon pea) and Sesbania sesban (L.) Merr. (sesbania) seeking for mixed grasses and legumes pastures. The following characteristics were evaluated: emergence porcentage, speed of germination index, root density, dry mass of roots, nodules, leaves and stems and leaf/stem ratio. At weekly intervals the height and leaf number of the plants were evaluated, totalising six evaluations. The results indicated that: a) the P. maximum cultivars presented allelopathic potential, that varied depending on the species of forage legume evaluated; b) the cv.Mombaça was more allelopathic to the legumes.

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Allelopathy of Panicum maximum Jacq. Cultivars on Tree and Shrub Forage Legumes: Greenhouse Estimate

The available information about allelopathic effects of the genus Panicum on tropical forage legumes is scarce and inconclusive. Based on this fact this research was carried out, under greenhouse conditions to evaluate potential allelopathic effects of aqueous extracts (0,10 and 20%) of three cultivars of Panicum maximum Jacq. cv. Mombaça, cv. Aruana and cv. Tanzânia-1 on three forage legumes, Leucaena leucocephala (Lam.) de Wit. (leucaena), Cajanus cajan (L.) Millsp. cv. Kaki (pigeon pea) and Sesbania sesban (L.) Merr. (sesbania) seeking for mixed grasses and legumes pastures. The following characteristics were evaluated: emergence porcentage, speed of germination index, root density, dry mass of roots, nodules, leaves and stems and leaf/stem ratio. At weekly intervals the height and leaf number of the plants were evaluated, totalising six evaluations. The results indicated that: a) the P. maximum cultivars presented allelopathic potential, that varied depending on the species of forage legume evaluated; b) the cv.Mombaça was more allelopathic to the legumes.