Theme 02: Grass-Legume Mixtures

Description

The objective of this work was to evaluate the tolerance of three forage legumes (Leucaena leucocephala (Lam.) de Wit., Cajanus cajan (L.) Millsp. cv. Kaki and Sesbania sesban (L.) Merr.) to the allelopathic effects of three cultivars of Panicum maximum Jacq. (cv. Mombaça, cv. Aruana and cv. Tanzânia-1), under greenhouse conditions. The root and shoot tolerance indexes were calculated using the data of dry mass of roots and shoots of plants cultivated in pots and moistened with water or aqueous extracts (0,10 and 20%) of the cultivars of P. maximum. The results indicated that: a) the root tolerance index of the forage legumes was an indicator more sensitive than the shoot tolerance index, since the strongest allelopathic effects were observed in the roots; b) Sesbania was more tolerant to the grass extracts, followed by pigeon pea and leucaena, being the last the more susceptible to the grass extracts.

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Allelopathy of Panicum maximum Jacq. Cultivars on Tree and Shrub Forage Legumes: Tolerance Index

The objective of this work was to evaluate the tolerance of three forage legumes (Leucaena leucocephala (Lam.) de Wit., Cajanus cajan (L.) Millsp. cv. Kaki and Sesbania sesban (L.) Merr.) to the allelopathic effects of three cultivars of Panicum maximum Jacq. (cv. Mombaça, cv. Aruana and cv. Tanzânia-1), under greenhouse conditions. The root and shoot tolerance indexes were calculated using the data of dry mass of roots and shoots of plants cultivated in pots and moistened with water or aqueous extracts (0,10 and 20%) of the cultivars of P. maximum. The results indicated that: a) the root tolerance index of the forage legumes was an indicator more sensitive than the shoot tolerance index, since the strongest allelopathic effects were observed in the roots; b) Sesbania was more tolerant to the grass extracts, followed by pigeon pea and leucaena, being the last the more susceptible to the grass extracts.