Characterization by Fluorescence of Organic Matter from Oxisols under Sewage Sludge Applications

Autor(es)

dos Santos, Larissa Macedo ^{[1, 2]} ; Bastos Pereira Milori, Debora Marcondes ^[2] ; Simoes, Marcelo Luiz ^[2] ; Lopes da Silva, Wilson Tadeu ^[2] ; Pereira-Filho, Edenir Rodrigues ^[3] ; de Melo, Wanderley Jose ^[4] ; Martin-Neto, Ladislau ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Embrapa Agr Instrumentat, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

^[4] Univ State Sao Paulo, Dept Technol, BR-14884900 Jaboticabal, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Soil Science Society of America Journal; v. 74, n. 1, p. 94-104, JAN-FEB 2010.
• Citações Web of Science: 7

Resumo

Sewage sludge from wastewater treatment contains organic matter and plant nutrients that can play an important role in agricultural production and the maintenance of soil fertility, The present study has aimed to evaluate the degree of humification following sewage sludge application of soil organic matter by laser-induced fluorescence and humic acids using ultraviolet-visible fluorescence, and including comparison with Fourier-transform infrared spectroscopy and elemental analysis. Sewage sludge applications to the soil caused a decrease in the degree of humification of the soil organic matter and humic acids for both a Typic Eutrorthox (clayey) soil and a Typic Haplorthox (sandy) soil of around 14 and 27%, respectively. This effect is probably clue to incorporation of newly formed humic substances from the sewage sludge into the characteristics of less humified material, and to the indigenous soil humic substances. The minor alterations observed in the clay soil probably occurred due to both the greater mineral association, which better stabilized the indigenous soil organic matter, and the higher microbial activity in this soil, which accelerated sewage sludge mineralization. Sewage sludge applications increased the C content for the clay and sandy soils by 7.4 and 15.4 g kg(-1), respectively, suggesting a positive effect on these two soils. (AU)

• Processo FAPESP: 99/09133-4 - Estudos espectroscópicos da complexação de íons metálicos com a matéria orgânica e constituintes húmicos de solos sob diferentes manejos
• Beneficiário: Martha González Pérez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 98/14270-8 - Centro de Ciências Ópticas e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs