Produção Nacional
Revisado por pares
Efeito alelopático de espécies de brachiaria griseb. sobre algumas leguminosas forrageiras tropicais. II. avaliações em casa de vegetação
1997; INSTITUTO DE ZOOTECNIA IZ/APTA-SAA/SP; Volume: 54; Issue: 2 Linguagem: Inglês
ISSN
1981-4100
AutoresAna Regina Pimentel de Almeida, Antonio A. Lucchesi, Marcela Ribeiro Abbado,
Tópico(s)Agronomic Practices and Intercropping Systems
ResumoThe trial was conducted in greenhouse, of the Instituto de Zootecnia, in Nova Odessa state of Sao Paulo, Brazil, from March to May, 1991. The objective was to evaluate the allelopathic effects of aqueous extracts in two levels (A = 8.2ml and B = 16.4ml/pot), obtained from three Brachiaria species: B. decumbens, B. humidicola and B. brizantha cv. Marandu on the following legumes: Centrosema pubescens, Calopogonium mucunoides, Macrotyloma axillare cv. Guata and Stylosanthes guianensis ssp. guianensis. The allelophatic effects, were evaluated through seed germination and dry matter production of shoots, roots and nodules, as well as the percentages of nitrogen, phosphorus, calcium, magnesium and potassium in the shoot, and of nitrogen in the roots of forage legumes. The results showed that: a) the Brachiaria spp aqueous extracts, especially B. decumbens, presented allelopathic effects, stimulating the dry matter production of the shoots, roots and nodules of C. mucunoides; b) the Brachiaria spp aqueous extracts showed a tendency to decrease the dry matter production of the shoots and roots of C.pubescens, M. axillare cv. Guata and S. guianensis; c) the highest level of the B. brizantha cv. Marandu aqueous cxtractc, decreased the root dry matter production of the legumes; d) The B. decumbens aqueous extracts, at the highest level increased the root's dry matter production or the legumes; e) the species or Brachiaria studied showed high allelopathic potential, which varied according to the legume specie evaluated.
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