Abstract

PESQUEIRA, J; HUARTE, H.R  and  GARCIA, M.D. Producción de biomasa y respuesta a la fertilización de especies forrajeras subtropicales cultivadas en La Pampa deprimida bonaerense. RIA. Rev. investig. agropecu. [online]. 2016, vol.42, n.1, pp.79-86. ISSN 1669-2314.

Summer forage biomass production of Buenos Aires flooding Pampa is often deficient for livestock feeding. An alternative to increase it is the culture of subtropical perennial species. Some of them produce large amounts of biomass, and have also shown good adaptation to environmental conditions similar to that of the area. Despite being perennial species, studies performed so far in the area generally cover only the first two years of crop growth. Therefore, the objectives of this study were: i) to evaluate the productivity of subtropical perennial forage-species compared to that of the natural grassland during five years after crop implantation and ii) to evaluate the effect of nitrogen fertilization on the biomass production of the subtropical species in the area. The evaluated species were Panicum coloratum cv. Klein Verde; Chloris gayana cvs. Finecut and Topcut and Setaria sphacelata cv. Narok. The experiment was conducted in Veronica (Punta Indio, Buenos Aires), which belongs to the region of Buenos Aires flooding Pampa. Dry aerial biomass (DAB) of the subtropical species exceeded that of the natural grassland, during the same period of growth. Nitrogen fertilization increased aerial dry biomass production. Until the third growth cycle, there was a good recovery of the plants after winter periods. However, C. gayana and S. sphacelata did not resume growth during the spring of the fourth growth cycle. Instead, P. coloratum continues in production five years after the implantation. The data highlighted that: i) subtropical species produced more than the natural grassland during summer in Buenos Aires flooding Pampa; ii) nitrogen fertilization is a useful tool to increase biomass production and iii) it is necessary to increase knowledge about factors affecting subtropical forage perpetuity in this region.

Keywords : Subtropical species; Aerial biomass; Nitrogen fertilization; Flooding Pampa.

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