Corresponde a artículos científicos de docentes investigadores que no pertenecen a un Núcleo de Organización y Ejecución de Actividades Científicas y Tecnológicas (NACT) de la UNNOBA. http://repositorio.unnoba.edu.ar/xmlui/handle/23601/598 2026-04-18T01:12:35Z 2026-04-18T01:12:35Z http://repositorio.unnoba.edu.ar/xmlui/handle/23601/954 2025-10-20T18:42:08Z 2025-07-01T00:00:00Z

Estructura y eficiencia del pastoreo bajo distintas alturas de utilización en pasturas de festuca alta y alfalfa La festuca alta (Festuca arundinacea Schreb) es la principal gramínea forrajera perenne templada utilizada en la región pampeana en suelos con limitaciones para rendimientos agrícolas competitivos. Por su parte, la alfalfa (Medicago sativa L.), es la leguminosa forrajera dominante en suelos de aptitud agrícola de la región pampeana y se utiliza pura (60 %) o asociada con gramíneas templadas (40 %). Está demostrado que, en festuca, el aumento de la intensidad de pastoreo extiende el período requerido para que la pastura alcance las tasas máximas de crecimiento y, con pastoreo poco intenso, los procesos de crecimiento bruto, envejecimiento y muerte de tejidos ocurren más rápidamente (Parsons, 1983). En el caso de la alfalfa, la persistencia, la producción y la calidad dependen principalmente del período de descanso entre pastoreos y la intensidad de defoliación tendría poco impacto en la productividad y el valor nutritivo de la especie. Con el objetivo de generar conocimiento de los procesos involucrados en la respuesta al pastoreo y mejorar las recomendaciones de manejo, se realizaron dos experimentos para evaluar la respuesta de festuca alta y alfalfa a tres alturas de pastoreo, utilizando un periodo de descanso entre pastoreos ajustado a la vida media foliar estimada para cada especie. No se detectaron diferencias en acumulación neta de forraje y en eficiencia de pastoreo en respuesta a la intensidad de defoliación para festuca alta. En cambio, en alfalfa, la intensidad de pastoreo afectó la tasa de crecimiento neto de la pastura y la eficiencia de pastoreo.; Tall fescue (Festuca arundinacea Schreb) is the main temperate perennial forage grass used in the pampa’s region in soils with limitations for competitive agricultural yields. On the other hand, alfalfa (Medicago sativa L.), is the dominant forage legume in soils suitable for agriculture in the pampas region and is used pure (60%) or associated with temperate grasses (40%). It has been shown that, in fescue, increased grazing intensity extends the period required for pasture to reach maximum growth rates and, with low grazing, the processes of gross growth, aging and tissue death occur more rapidly (Parsons, 1983). In the case of alfalfa, persistence, production and quality depend mainly on the resting period between grazing and the intensity of defoliation would have little impact on the productivity and nutritional value of the species. To generate knowledge of the processes involved in grazing response and improve management recommendations, two experiments were carried out to evaluate the response of tall fescue and alfalfa at three grazing heights, using a rest period between grazing adjusted to the estimated leaf half-life for each species. No differences were detected in net forage accumulation and grazing efficiency in response to defoliation intensity in tall fescue. In contrast, in alfalfa, grazing intensity affected the net pasture growth rate and grazing efficiency.

2025-07-01T00:00:00Z http://repositorio.unnoba.edu.ar/xmlui/handle/23601/930 2025-08-20T20:49:38Z 2025-04-02T00:00:00Z

Enhancing water use efficiency in wheat: 40 Years of genetic gains in the Argentine Pampas Understanding the impact of breeding on water use and productivity, particularly in underexplored environments where pre-anthesis rainfall is often limited, is crucial for increasing wheat grain yield (GY) under future climatic scenarios. The aim of this work was to study the effects of breeding on GY and its physiological determinants, including water use and water use efficiency among cultivars released to the Argentine market over a 40-year period. Ten Argentinean cultivars classified into early cycle (EC) and late cycle (LC), based on time to anthesis, were grown across three seasons (2015, 2016, and 2017) under irrigated, rainfed, and water restricted conditions. Breeding increased GY by enhancing the harvest index (HI) in LC cultivars and the total biomass (BT) in EC cultivars. These improvements were accompanied by increases in water use efficiency for grain yield production (WUEGY,ETc) of 1.11 % and 0.45 % per year among LC and EC cultivars, respectively, and a 0.29 % per year improvement in water use efficiency for biomass production (WUEBT,ETc) among EC cultivars. Crop evapotranspiration (ETC) decreased by 0.16 % per year exclusively in LC cultivars. Transpiration use efficiency (TE) improved by 0.55 % and 0.45 % per year for LC and EC cultivars, respectively, driven by increases in radiation use efficiency (RUE) of 0.46 % and 0.24 % per year. Notably, no changes in canopy conductance (gC) were observed. Finally, the proportion of water transpired before anthesis (pPREANT TC) decreased by 0.45 % per year in LC cultivars. The results of this study indicate that genetic improvement in Argentina has enhanced GY by increasing WUE and RUE, rather than total ETC. This is a particularly beneficial outcome for rainfed farming systems with limited water availability

2025-04-02T00:00:00Z http://repositorio.unnoba.edu.ar/xmlui/handle/23601/929 2025-10-20T18:45:01Z 2024-03-20T00:00:00Z

Florisgrafía: Interacciones microscópicas entre tintas y materiales orgánicos. Un estudio de la epidermis de pétalos bio-impresos. Este estudio explora la florisgrafía como una práctica experimental en la intersección del arte, la ciencia y la tecnología. A través de la microscopía óptica y de fluorescencia, se analizan las interacciones entre tintas y materiales orgánicos en la bioimpresión sobre pétalos de rosa. Se examinan los cambios estructurales de la epidermis, la absorción de pigmentos y la modificación de la morfología celular debido a la aplicación de solventes y presión. Los hallazgos sugieren que la florisgrafía no solo amplía las posibilidades gráficas, sino que también redefine los límites entre materialidad, temporalidad y representación en el arte contemporáneo.

2024-03-20T00:00:00Z http://repositorio.unnoba.edu.ar/xmlui/handle/23601/839 2024-08-15T19:02:14Z 2022-01-01T00:00:00Z

Upgrading of Tall Fescue Grass Pyrolytic Bioliquid and Catalytic Valorization of The Biofurfural Obtained The production of added value products following catalytic hydrogenation reactions of bioliquids was studied. These bioliquids were obtained from the pyrolysis of raw and acid-treated (H3PO4) Tall Fescue (Fescue arundinacea) waste. Before the pyrolytic test, the biomass samples were analyzed by a micro thermogravimetric analysis coupled with FTIR spectroscopy (TGA-IR), which enables the chemical identification of functional groups of gaseous molecules originated by solid/gas transformations. From these results, the pyrolysis temperature was selected, and bench scale pyrolysis reactions were carried out. The pyrolysis bioliquids showed high furfural concentration, 46 and 70% for fescue and acid washed fescue, respectively. The bioliquid with the highest furfural concentration was catalytically hydrogenated in aqueous phase. A batch reactor was employed, with Ru/C and Ru-Sn/C catalysts to produce high added value alcohols.

2022-01-01T00:00:00Z