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Panicum virgatum (swich-grass) is cultivated in some countries to obtain biomass used in the production of heat, fiber, electricity and second generation ethanol. Currently, in Argentina, this species is used for forage and as an ornamental. The aim of this work was to design an agroclimatic zoning model for swich-grass in Argentina, both for upland and lowland ecotypes, based on its bioclimatic requirements and employing a Geography Information System. The variables taken into consideration were: average temperature during growing period and reproductive period, frost free days and rainfall during growing season. This work demonstrated that an ample region of the country is agro-climatically suitable for the implantation of switch-grass in rainfed conditions or with complementary irrigation. The agroclimatic zoning for the upland ecotype shows that suitability reaches latitudes of up to 46ºS, while the lowland ecotype can be grown up to 40ºS. Thornthwaite's Moisture Index equal to zero was overlapped to the Argentinean agroclimatic zoning for upland and lowland types, to obtain the potential growing areas under dry-subhumid, semiarid to arid climates. The areas where switch-grass should be effectively tested are those categorized as optimal, very suitable, suitable, and very suitable/suitable with irrigation, located to the West of TMI equal to zero, which include dry-subhumid (0

El área de estudio se encuentra ubicada en el partido de Tandil, en el centrosudeste de la provincia de Buenos Aires. Las coordenadas geográficas son: 37°10'S y 37°30' S; y 59°00' W y 59°15' W. La geología y fisiografía de Tandil generaron suelos óptimos para las actividades agrícola-ganaderas, razón por la cual reviste interés el conocimiento de las propiedades edáficas con el fin de optimizar los rendimientos. El objetivo del presente trabajo fue el de analizar las características topográficas a través de la confección de curvas de nivel y el modelo digital de elevación y algunas características edáficas: aptitud de uso, presencia de tosca o roca, profundidad y espesor del horizonte subsuperficial y drenaje interno, para relacionarlas con la actividad agrícola. Todos los resultados se presentaron en cartas temáticas, a escala 1:50 000. A través de la visualización de las cartas se interpretaron más fácilmente los resultados referidos a las precauciones que deberían tomarse para disminuir la erosión hídrica en aquellos sectores del terreno con pendientes pronunciadas, en qué áreas actúan como limitantes para la agricultura la tosca, la roca subsuperficial, el horizonte B2t y el drenaje imperfecto. The studied area is placed in the Center-Southwest Tandil district. The coordinates are 37°10' S, and 37°30'S; and 59°00'W and 59°15'W. Physiographic and geological characteristics support very good soils for agriculture and cattle activities, and then it is important to know the edaphic properties in order to optimize agricultural production. Topographic characteristics through contour lines, DME and some edaphic characteristics' analysis, aptitude use, rock and petrocalcium horizon presence, depth and thickness of sub-superficial horizon and internal drainage and their relation with agriculture activities, were the object of this paper. Thematic cartography at 1:50000 scale was presented. The study results allow to take precautions in order to decrease the hydric erosion in steep slopes. Those areas are restricted to agriculture due to petrocalcium horizon, sub-superficial rock, horizon B2t and imperfect drainage.

El delta del Paraná conforma una unidad diferenciada de su entorno: la selva de rivera. Sufre periódicas inundaciones como consecuencia del desborde de los ríos o por la sudestada que provoca el ingreso de las aguas del Río de la Plata en dirección contraria a su escorrentía natural. El sector interno de las islas presenta una capa freática cercana a la superficie y el perfil de los suelos es una sucesión de capas de diferente espesor y granulometría. En cambio en las partes altas se ha desarrollado un horizonte superficial, característico de los molisoles. Actualmente el principal destino de los suelos es forestal o ganadería extensiva estacional pero, es posible que en un futuro, debido a la creciente demanda de alimentos sean acondicionadas para fines agrícolas. El objetivo del presente trabajo es el de analizar las principales limitaciones de los suelos' presentes en el delta argentino y cartografiarlos a escala 1:500000 a nivel de unidad cartográfica. Las limitantes estudiadas fueron la textura superficial y subsuperficial, salinidad, alcalinidad, drenaje y peligro de anegamiento. Se utilizaron los datos presentes en la cartografía de suelos a escala 1:500000 y l: 200000. The Delta of Parana conforms a different unit of its surrounding environment : the shore jungle. It's a zone characterized by several and frecuent inundations as consequence of rivers overflow or by south east wind which causes the Río de la Plata water to enter in opposite direction to its natural flow. The islands internal area presents a phreatic layer near the surface and the si de view soils have several layers of different thickness and granulometric types. Otherwise, a shallow soil horizon has developed at high sectors, mainly characterized by mollisels. At present, main land use is forestry or livestock, but in the future it's posible to prepare the soil for agricultúral purposes, because of food demand m crease. The objetive of this paper is to analize the main limitations of present soils in the Argentinian delta and map them with 1:500000 scale as a cartographic unit. Studied limitations were: surface and undersurface texture, alkalinity, salinity, drainage and overflowing. Present data were used in soils cartography with scale 1:500000 and 1:200000.