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| Author(s): |
Marcos Schaaf Teixeira da Silva
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2009-05-19 |
| Examining board members: |
Marcos Vinicius Folegatti;
Denis Cesar Cararo;
Celia Regina Montes
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| Advisor: | Marcos Vinicius Folegatti |
| Field of knowledge: | Biological Sciences - Ecology |
| Indexed in: | Banco de Dados Bibliográficos da USP-DEDALUS |
| Location: | Universidade de São Paulo. Biblioteca Central da Escola Superior de Agricultura Luiz de Queiroz; ESALQ-BC/t634.31 94625; S586i |
| Abstract | |
The crisis of the water, the sewage domestic increase generated in stations of treatments and the spilling of these effluents in bodies of water are suggesting new solutions for those problems. The disposition of wastewater treated in soils implicate in the nutrient and organic matter recycling, acting as a complementary process to the treatment of those waters. Rich in nutrients mainly N (Nitrogen), P (Phosphorus) and Na (Sodium) the treated wastewater has been used in the agriculture through technical criteria as source of nutrients for several crops. Before this context, the objective of this work was to analyze the possible effects of the irrigation with effluent treated in some chemical and physical properties of a soil cultivated with Orange. The experimental area located her beside the Station of Sewage Treatment (SST) Piracicamirim that is located in the margins of the highway \"Luiz de Queiroz\" in the municipal district of Piracicaba, São Paulo State. The applied treatments were related to the percentile of humidity of the field capacity varying in T100%, T125%, T150%, T200% and TSI (treatment without irrigation). The experimental design was a split plot scheme of randomized blocks subdivided in time, with five treatments and three repetitions. The accomplished fertilization was the one of half of the dose recommends for the orange crop. In whole the study the soil samplings were accomplished in the layers 0-10, 10-20, 20-40, 40-60, 60-80 and 80-100, while the samplings of soil solution were accomplished in the depths 30, 100 and 200 cm. The chemical variables determined in the soil were pH, H + Al, Al, Na, K, Ca and Mg. In soil solution the variables were pH, CE, Al, Na, K, Ca and Mg. The certain physical variables were fraction particle sizing and degree of clay dispersion. The sewage effluent treated (SET) used presents low concentrations of Ca, Mg, In the, K, Al, CE and RAS when compared with values found in the literature. For that fact, SET present potential minor of alterations in the chemical and physical properties of the soil. The exchangeable sodium and PST increased in elapsing of the experiment, while the concentration of sodium in the soil solution decreased. The exchangeable calcium in the soil suffered decrease in the superficial layers, and increase in the subsuperficial layers. The perspectives of the irrigation of SET in the orange crop are promising, have seen the importance of the culture in the Brazilian and world scenery. However, it is suggested studies of long period in order to monitor the possible impacts to cause in the structure of the soil. (AU) | |