Abstract

PELAEZ, D.V.; BLAZQUEZ, F.R.; GIORGETTI, H.D.  and  RODRIGUEZ, G.D.. Respuesta de la vegetación a un rolado en la Provincia Fitogeográfica del Monte, Buenos Aires, Argentina. RIA. Rev. investig. agropecu. [online]. 2021, vol.47, n.2, pp.224-231.  Epub Sep 15, 2021. ISSN 1669-2314.

Although the rolling chopping has been successfully used in different regions of Argentina, its impact on the rangelands vegetation of the southern Phytogeographical Province of the Monte has been little studied. The objective of this work was to evaluate the effect of roller chopping on cover and density of the most conspicuous woody and desirable perennial grasses in the south of the Phytogeographical Province of the Monte, Argentina. Roller chopping reduced initial percentage cover of Condalia microphylla, Prosopis spp. and Prosopidastrum angusticarpum by 1 or 2 years. However, roller chopping only significantly reduced the initial Prosopis spp. density. Piptochaetium napostaense was the desirable perennial grass most affected in the first 3 years post-treatment. Contrarily, Poa ligularis, Nassella tenuis and Nassella longiglumis were the most favored desirable perennial grasses by the roller chopping. In general, our results show that roller chopping reduces woody species cover markedly for at least 3-5 years. The results of the present study also suggest that the reduction of the woody species cover might encourage increased in the long time (> 3 years) the foliar cover and density of P. ligularis and N. tenuis. A period of a least one year after roller chopping without grazing or with light grazing would be necessary to permit recovery, mainly of P. napostaense, of desirable perennial grasses.

Keywords : woody control; desirable perennial grasses; density; cover..

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