Potencial alelopático de leucena e de sabiá na germinação, na emergência e no crescimento inicial do sorgo.

Abstract

Allelopathic potential of leucena and sabiá on germination, emergence and initial growth of sorghum. Allelopathy is an interaction between plants through exudation of secondary metabolic products, present in all tissues of the plant and, that when released into the soil can hinder or encourage the establishment of other plants. The aim of this experiment was to evaluated the allelopathic effects of Leucaena and Mimosa extracts on the seeds germination and initial growth (experiment I) and the effects of the roots exudates on the emergency and initial growth of sorghum (experiment II). In the experiment I, it was used aqueous of leaf extracts (0; 20; 40; 60; 80 and 100 % concentrations). In the experiment II, Leucaena and Mimosa seedlings it was maintened with sorghum seedlings. The extracts of Leucaena and Mimosa not influenced the germination of sorghum seeds. The length of the shoots of sorghum was reduced when using the leaves of Leucaena from 60% concentration, while the Mimosa leaf extract showed inhibitory activity when increased the concentration of the extract. The association of sorghum with Leucaena caused inhibition of shoot growth of sorghum, whereas the association with Mimosa plants inhibited root growth of sorghum.