Qualidade da irrigação no Projeto Formoso em Bom Jesus da Lapa–Bahia

Abstract

The irrigated perimeters of the valley of the Company for Development of Vales of São Francisco (CODEVASF) carry important role in economic scenario of the Northeast, because in addition to generating jobs and income for most people, contribute to the significant revenue from agricultural activities . Although the agribusiness be profitable, there are numerous problems faced by the productive chain, highlighting the relationship between the physicochemical water and soil, in addition to indicators of uniformity, which combination, if inadequate, can promote significant drop in productivity and rising production costs, especially in irrigated systems. This study aimed to evaluate the quality of irrigation on the basis of performance in terms of current management and operation of irrigation system used in Project Formoso in Bom Jesus da Lapa, Ba, 14 plots were irrigated by micro sprinkler and conventional. Samples were collected at two different depths (0-30cm and 30-60cm) of different profiles of soils cultivated with various crops, the land classified as PSAMENT (NQ), Red- YELLOW Distrophic (LVAd), Red-YELLOW Distrophic (PVAd) and Eutrophic Red- Yellow (PVAe), determining the size, bulk density, total porosity, macro and microporosity, soil water retention curve in the soil, available water and total water availability in the soil (DTA) . We assessed levels of pH, macronutrients (Ca, Mg, P, K and Na), plus the percentage of aluminum saturation (m%), total bases (S), cation exchange capacity (CEC) and percentage of saturation bases (V). The quality of irrigation was evaluated based on indicators of performance (CUC, CUD, CUE and CV) in two irrigation systems (sprinkler and conventional microaspesão). The perimeter of irrigated land Formoso displays which are physically very different, requiring different management on irrigation, it was found that the soil samples showed within normal limits, has led to concern about its management. As for nutrients, it was observed that with excesão of phosphorus, all submit themselves to appropriate levels. For the systems studied, the micro irrigation system was more efficient than the conventional sprinkler irrigation.