Alterações nas características do solo e no desempenho do sistema de irrigação (Bubbler) operando com água residuária

• Autor(a) principal: Carmo, Francicleiton Freires do
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFERSA
• Texto Completo: https://repositorio.ufersa.edu.br/handle/tede/498
• topic: Irrigation - wastewater; Domestic sewage; reuse; Agriculture - soil characteristics; Irrigação água residuária; Esgoto doméstico; Reuso; Agricultura Características do solo; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA

The utilization of treated domestic wastewater for irrigation is an alternative to control pollution of surface and groundwater, as well as a way to provide water and nutrients for plants. Thus, the present work was to study the changes in soil characteristics and performance of irrigation (Bubbler) operating system with wastewater from domestic sources. To this end, was mounted an experimental area of 576 m2 in the Miracles settlement in Apodi-RN, endowed with a system for primary treatment of domestic sewage, and four subunits of the irrigation system "Bubbler". The treatments were made up of different proportions of primary domestic sewage (PDS) and water supply (WS) were: T1 (0% of PDS and 100% of WS, more chemical fertilizer [witness]), T2 (33 % of PDS and 67% of WS), T3 (67% of PDS and 33% of WS) and T4 (100% of PDS and 0% of WS). To analyze the performance of the irrigation system, it was used a split plot arrangement having the plots and subplots evaluation times (0, 120 and 240 days of operation). In the analysis of soil physic-chemical characteristics was used split split plot scheme with the treatments on plots, the sampling depths on subplots (0 to 0.20 m and 0.20 to 0.40 m) and the evaluation periods on subsubplots (0, 120 and 240 days after transplanting). The experimental design used was the completely randomized blocks with four treatments and six repetitions. The Data were submitted to analyzes of variance and regression and tests in the average. During the experimental period was determined physico-chemical and microbiological characteristics of the PDS and WS, and the results indicated that the quality of PDS and WS do not compromise the use for the agricultural crop, and may be used to management criteria. The highest levels of emitter clogging were found in T4 and T3. The T2 provides better performance of the irrigation system, showing better uniformity coefficient (CUC and CUD) and application efficiency (AE). With respect to soil characteristics, it was observed that the values of EC, P, K, Ca and Al there were no statistically significant changes in treatments, altering with only soil depth and the time of treatment application. The characteristics pH, V, SB and Zn tended to reduce with increasing proportion of PDS and the time of application. The characteristics N, MO, Mg, Na, PST, H + Al, m, t, CTC, Cu, Fe and Mn tended to be greater with increasing proportion of PDS and the time of application. The total coliforms and fecal coliform tended to be greater with increasing proportion of PDS and reduced with increasing soil depth