The purpose of this study was to verify the allelopathic effect of aqueous extract from the Pinus taeda needles on the germination and development of black oat (Avena strigosa) seedlings. The work was carried out at the Plant Physiology and Biochemistry Laboratory at the Federal Technological University of Paraná (UTFPR), Campus Pato Branco, using a completely randomized design with factorial distribution in three replicates, under temperature, humidity and light controlled conditions. The extract from the pine needles was composed of five percentages (0, 25, 50, 75 and 100%) from the crude extract (EB) dilution, composed of distilled water + pine needles in vegetative stage (green needles), moderately decomposed (dry needles) and in advanced decomposition (decomposed needles). The germination percentage, average speed of germination, the length of the primary roots and the length from the seedlings roots of Avena strigosa were evaluated. The stage of green needles affected the variables studied and showed linearly effect with the increasing concentration of the crude extract.
black oat; inter-specific allelopathy; pine; silvipastoral system
