Estudo e diagnostico da agricultura irrigada na região do alto da bacia hidrografica do rio Itapicuru - Bahia / Assessment and diagnostic of the irrigated agriculture in the upper part of the Itapicuru river basin - state of Bahia

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Irrigation is a key factor for increasing crop yield in arid and semiarid regions, but the inadequate use of irrigation can lead to serious concerns related to economical and environmental aspects. The Itapicuru river basin, in the northeast of the State of Bahia, with more than 90% of the area in the so-called Drought Polygon Region, has received heavy investments from the public sector for the development of irrigated agriculture in the last years, which brought about concerns on the sustainability of those irrigated areas on the long run. One of these aspects is the simplified evaluation to which the soils were submitted on its suitability for irrigation prior the implementation of irrigation projects in the area. In this study, it was observed that irrigation is actually practiced where the soil is not suitable and where the soil is adequate the irrigation is not practiced. Then, using the recently published Brazilian System of Soil Classification for Irrigation, an up-dated map of potential areas for irrigation was obtained from the combination of many attributes. The use of remote sensing techniques through the NDVI allowed discriminating the areas where irrigation is practice with and without the permission of the Bahia Water Resources Department. Such discrimination can be used for a better planning and use of the water resources in the basin. The study identified projects that are under development in areas where soil is not recommended for irrigation while areas with no irrigation in the present were also indicated for future expansion. In local scale, in the context of the Ponto Novo Irrigation District, this study allowed to validate the methodology by comparing the crop performance in parcels with and without soils considered suitable for irrigation according to the adopted methodology. Theses results pointed out for the low economic sustainability of projects implemented in areas with poor quality soil for irrigation in semiarid areas

ASSUNTO(S)

desenvolvimento sustentavel agricultural sustainable land use river basins irrigação development bacias hidrograficas sustainable solo - uso agricultura sustentada geographical information systems irrigation land for irrigation

ACESSO AO ARTIGO

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