INVESTIGADORES
BENTIVEGNA Diego Javier
congresos y reuniones científicas
Título:
Competition between Baccharis ulicina and native grasses of the genus Nassella, in response to a cutting as control tool
Autor/es:
TUCAT G.; DADDARIO J.F.F.; BENTIVEGNA D.J.; FERNÁNDEZ O.A.; TORRES Y.A.
Lugar:
Santa Rosa
Reunión:
Congreso; VI Congreso Argentino y III Congreso del Mercosur deo Manejo de Pastizales Naturales; 2013
Institución organizadora:
Asociación Argentina para el Manejo de Pastizales Naturales
Resumen:
Baccharis ulicina (Asteraceae) is an herbaceous perennial species in grasslands of Southwest of Buenos Aires Province. In order to evaluate competition between B. ulicina (Bu) and the grasses Nassella clarazii (Nc) and Nassella tenuis (Nt) including a cuuting, a trial was conducted under greenhouse conditions. To this aim, five replicates of each species were grown in pots with 6 dm3 sandy loam soil with the following competition treatments: no competition (individual plants), intraspecific (10 plants of the same species) and interspecific (replacement series method Bu:Nc or Bu:Nt ratio, 8:2, 6:4, 4:6 and 2:8, respectively). With the exception of individual plants, treatments were water limited. After three months, plants were cut at 10cm from the soil surface. Then, dry weight (DW) and height were measured, and at the end of the trial height of plant and DW of shoot and root DW were registered. B. ulicina showed irregular heights at the different treatments. Regarding of DW of cutting, 10Bu treatment values were 120% higher than 2Bu-8Nt. Meanwhile, individual plants were on average 70% higher than the others. Shoot of 10Bu treatment achieved the highest accumulated DW, being 3.17 times smaller than the individual plants. Root DW decreased 52% from 10Bu to 8Bu-2Nc or Nt treatments. The lack of competition exerted by B. ulicina to native grasses is even enhanced by the realization of a cutting.