identifica como focos de desarollo -

1. Línea 1 / Agua Dulce:
La zona denominada Línea 1 se encuentra al norte del Chaco a la altura del Paralelo 20° S en la macro zona de Bosque y Matorrales, con suelos de muy buena calidad y condiciones climáticas muy favorables para la producción agropecuaria; el modelo de desarrollo se basa en la transformación de la cobertura boscosa y por su situación geográfica muy lejana de centros poblados importantes, todavía no existen centros poblacionales importantes que demanden bienes y servicios.
Otros factores a tener en cuenta son la disponibilidad de agua de buena calidad para la producción y la Reserva de Biosfera del Chaco que abarca parte importante de la misma.

( RESUME : Linea 1 / Agua Dulce ...with soils of very good quality and very favorable climatic conditions for agricultural production...other aspects are the availability of (subsurface-) water of good quality for production..)

2. Fuerte Olimpo (hasta Bahia Negra):
Otro polo de desarrollo lo constituye la zona de Fuerte Olimpo y toda el área de influencia del río Paraguay, donde se han desarrollado importantes inversiones agropecuarias principalmente por parte de inversionistas brasileños que apuntan gran parte de su producción al mercado externo.
Este polo de desarrollo se encuentra en otra macro zona denominada Bosques y Pastizales con otras condiciones naturales y otras limitaciones que serán descritas más adelante, pero no por ello menos aptas para la producción agropecuaria. La biodiversidad en esta área es más abundante considerando un régimen hídrico significativamente superior al Chaco Central y otras condiciones edáficas.
El modelo de desarrollo se basa en la transformación a campos de pastoreo de extensas áreas boscosas pero con poco desarrollo demográfico marcado por las condiciones naturales del lugar.

fuente SEAM

mapa principal ordenamiento

Soils of the Chaco

Soils are formed principally from fluvial deposits based on transported material from the rivers ... In addition to the predominantly flat topography, the scarcity of rain results in an arid zone that experiences frequent dust storms and extremely high temperatures. The soil evolved over deep sedimentary deposits that are either neutral or slightly alkaline, with a high level of base saturation (90-100%). There are marked differences between the soils of the eastern and western parts of the region: the eastern soils are predominantly clay with impeded drainage, frequently solodized with a shallow water table. The western soils are more loamy, comprising sandy loams in the far western areas. They have relatively good drainage and vary from low acidic or neutral to slightly alkaline in the surface horizons. The watertable is deep and may have high salinity. Because of the low rainfall, primary minerals and salts are abundant.

The soils are suitable for forestry and pastures and for cultivation in rotations, while perennial crops are grown under irrigation. Fertility in general is high, but availability of water is a limiting factor, as is the resulting salinization from poorly managed irrigation. There are no major restrictions to the use of machinery, necessary for all types of crop production.
As is usual in areas of warm climate with a long dry season, there is a strong flush of available nitrogen with the onset of the rains due to mineralization of the soil organic matter.

Vegetation types The predominant vegetation of the Chaco is open dry woodland with cacti and bromeliads, stretching continuously over large areas, with a grass ground cover. Schinopsis sp. (Anacardiaceae) is the dominant tree. Other typical vegetation types are palm savannahs, savannah parkland, low tree and shrub savannah, with halophytic shrubs on saline patches.
The Paraguayan Chaco has mesophytic vegetation in its eastern (oriental) part where rainfall is higher, varying from 1 000 to 1 300 mm/yr, but changes to xerophytic in the extreme west, where rainfall falls to a maximum of 600 mm/yr. The intermediate central region is described as mesoxerophytic with annual rainfall between 600 and 1 000 mm.

Palm groves: these takes their name from the caranday palm (Copernica alba), which grows in the lowlands, above the marshes, in broad strips. The understorey of the palm groves consists of grasses with weeds and some shrubs. Grazing animals eat the fruits and spread the seeds of the palm, which pass undigested into the faeces. The groves are on footslopes between the higher ground and the swamps. Espartillo-type grassland occupies the higher areas. The main grasses are Sorghastrum agrostoides, Paspalum panciliatum and Paspalum plicatulum. Among the legumes are Desmanthus virgatus, Desmodium incanum, Galactea sp. and Phaseolus lathyroides, all of them well known forages that have been the basis for several commercially-grown forage cultivars in Australia.

Espartillo grasslands: as noted above, these occupy higher ground and are not flooded regularly. The soils are hydromorphic over clay subsoil, though the external drainage is good. The soils are well supplied with phosphorus, calcium and potassium. The following grasses are found: Elionorus latiflorus, Aristida circinalis, Tridens brasiliensis, Paspalum plicatulum, Spartina argentinensis, and Trichloris pluriflora. There are very few herbaceous legumes; Desmanthus virgatus is found occasionally. Trees include Prosopis campestris, P. nigra, P. algarrobilla and Copernica alba.

Thorn forest: this is found in the central and eastern plain, where trees and shrubs dominate over grasses. Soils are mainly alluvial, saline and alkaline saline. Drainage is fair and allows growth of woody perennials such as quebracho colorado (Schinopsis lorentzii), quebracho blanco (Aspidosperma sp.) and palo santo (Bulnesia sarmiento). Also found are vinal (Prosopis ruscifolia) and algarrobilla (P. algarrobilla). Herbaceous forage legumes are rare, e.g. Desmanthus virgatus and P haseolus lathyroides. The grass cover is made up mainly of Elyonurus latiflorus, Aristida adscensionis and Heteropogon contortus. Trichloris trinita is found in low-lying, more humid, areas but does not contribute greatly as livestock feed. The high density of Prosopis makes it difficult for animals to enter the grazing areas. As Prosopis pods are eaten by livestock, undigested seeds are dispersed and add to the spread and invasiveness of the trees.

The potential of the Chaco
The Chaco is land of good potential; while it does have a climate with marked wet and dry seasons, its thermal growing season is long to continuous, and its soils fertile and derived from deep alluviums. The Chaco compares favourably with other areas of the world with similar climates.

an extremely aproximate map of global soil fertility (dark green indicates highest and red lowest fertility), and controversial in some aspects. It does however indicate that the Chaco Paraguayo (except the west) has quite fertile soils

Northern Chaco - a very approximate map of soil potential.

light blue (A) indicates : very high soil fertility apt for both crops and improved pasture
sand color (B) indicates : good soil fertility apt for both crops and improved pasture
light green (C) indicates : heavy lowland soils of limited ventilation, making good natural pasture, not apt for crops
brown (D) : light sandy soils with little organic matter, very wind erosion prone, limited use for crops and pasture
pink (E) + red (F) : not apt for any agro use

anual rainfall

high salt content in subsurface water is a severe problem in the Chaco.
This map's black area indicates where abundant sweet water is being found when drilling wells.