Potencial de irrigação das terras da região do médio curso do Rio Paraíba utilizando geotecnologias.

Abstract

The development of sustainable irrigated agriculture requires the availability of land with characteristics favorable to this practice. In this sense, the present work had as objective to establish the potential of the lands of the hydrographic basin of the region of the medium course of the Paraíba river for the use with irrigated agriculture. The work only deals with the potential of the soils, but does not consider the availability of water for irrigation, thus requiring that this information be available or complemented. The assessment of the potential of land for irrigation was based on the State's soil reconnaissance survey, and used the methodology of the American system of classification of land for irrigation with adaptations for the northeast region of Brazil. According to the studies carried out, it was observed that 11.67% of the total area is of arable land with restricted aptitude of class 3, where typical Orthic Chrome Vertisol soils and with a smaller area composed of thickarenic Eutrophic Argillic Plinthsol occur , with minimum requirements for irrigation. From class 4 of arable land for special use, it was observed that it presents 8.44% where the typical Ortic Quartzarenic Neosol occurs, which may have an excessive deficiency that limits its usefulness for certain crops or specific irrigation methods. The non-arable lands of class 6 presented an area of 79.89% where they occur with greater representation of typical Orthic Chromic Luvisol and typical Orthic Hypochromic Luvisol, followed by typical Eutrophic Litholic Neossolos, typical Natric Ortic Planosol, Solodic Haplic Eutrophic Planosol, Haplic Ta Eutrophic Cambisol typical, and latosol Dystrophic Yellow Argisol in which they are inadequate for conventional irrigation.