5.02b (148.00 ha Index 88)
It is the most important group, since it occupies more than 80% of the lands in this subzone. It exists repeatedly in the Departments. of Florida and in the Department of Flores (Tips of the San Jose) and in the rest of the region defined for zone 5. The relief is undulating and strongly undulating, with modal slopes of 5 to 7%. The geological material corresponds to variable lithologies of pre-Devonian rocks, such as granites, migmatites, schistose metamorphic rocks (around Rosario), etc. The soils are moderately deep and superficial Subeutric Haplic Brunosols (moderately deep Brown Grasslands and Regosols), to which Inceptisole (Lithosols) are associated, sometimes very superficial. The upper horizon is brown and reddish brown, sometimes yellowish brown, with a loamy texture, gravelly loam or sandy loam with abundant gravel, fertility is medium, sometimes low. The rockiness is moderate and varies between 2 to 10% of the area with outcrops. Throughout the area there may be narrow lowlands, associated with drainage routes of little importance, which contain hydromorphic Luvic Gleysols (Humic Gley) and Typical Eutric or Luvic Brunosols (Black Prairies and Maximal Brown Prairies), which contain very good summer pastures. The use is pastoral. This group corresponds to the San Gabriel-Guaycuru unit on the 1:1.000.000 (DSF) scale chart.
10.8b (15.09 ha Index 184)
Most of the gently undulating lands in the Departments correspond to this group. of Canelones and San José, located in the surroundings of population centers such as Libertad, San José, Tala, Canelones, Saint Baptist, etc. They exist to a lesser extent in the Departments. of Colonia y Maldonado. The geological material corresponds to clayey silt sediments of brown color and normally with calcium carbonate concretions. The relief is gently undulating to undulating with predominance of slopes of 1 to 4%, with a region around Tapia with slopes of 3 to 6%. It corresponds to areas with a lower degree of current erosion, defined as moderate, with associated areas of light erosion. Sheet erosion then predominates, with variable loss of the upper horizons. This group is normally located in positions with low erosion risk, such as high interfluves and gently sloping slopes. The soils correspond to Typical Ruptic and Luvic Vertisols (Grumosoles) and Typical Eutric and Subeutric Brunosols (Black and Medium Brown Grasslands), black or very dark brown in color, silty clay loam texture, high fertility and moderately well drained. This group corresponds to the Tala-Rodríguez, Libertad and San Jacinto units and integrates to a lesser extent the Ecilda Paullier-Las Brujas and Isla Mala units of the 1:1.000.000 (DSF) scale chart.
03.41 (0.92 ha Index 158)
This group corresponds to the large plain that is located on both banks of the Santa Lucia River, mainly in the section in which it is bordering between the Departments. of Canelones y Florida. A reference place is the Pueblo San Ramon, since to the north of it it appears with a significant extension. It is a high plain, occasionally flooded, with mesorelief, where high positions are dominant and present Melanic Eutric Planosols and Luvic Eutric Brunosols, hydromorphic (Brown to Maximum Black Grasslands) developed on clayey silt sediment, with very dark brown upper horizons. black, silty loam texture, high fertility and imperfect drainage. In high positions there may also be Eutric Argisols, sometimes Subeutric, Typical Melanic (Maximal Brown Grasslands). In depressed positions the Planosols already mentioned occur, although with a horizon of variable thickness (10 to 40 cm.), of accumulation (cumulic), of very dark gray to black color and texture of silty clay loam to silty clay. Also in depressed and humid positions there are Melanic Luvic Gleysols (Humic Gley), and associated with the water course in areas of alluvial sediments, Melanic Heterotextural Fluvisols (Alluvial Soils) develop, with river jungle vegetation. The use is pastoral, with high quality summer and winter pastures and parks of variable density, with the only limitation being the risk of flooding. This group corresponds to the San Ramon unit on the 1:1.000.000 (DSF) scale chart.
