347-9 Macro and Microporosity Of Mixtures Of Biosolid and Carbonized Rice Husk For Use As Agricultural Substrate.

Poster Number 1112

See more from this Division: ASA Section: Education & Extension
See more from this Session: General Advancing Agronomy Via Public-Private Collaboration: II

Wednesday, November 6, 2013
Tampa Convention Center, East Exhibit Hall

Maria Julia Carreiro Lima Ferreira1, Luiz Vitor Crepaldi Sanches1, Roberto Lyra Villas Boas2 and Thomas Fiore de Andrade3, (1)Soil Science, Univ. Estadual Paulista, Botucatu, Brazil
(2)Solos e Recursos Ambientais, FCA-UNESP, Botucatu, Brazil
(3)Ciencia do Solo, FCA-UNESP, Piracicaba, BRAZIL
Poster Presentation
  • 79978.pdf (452.8 kB)
  • Abstract:
    Macro and microporosity of mixtures of biosolid and carbonized rice husk for use as agricultural substrate.



    1Unesp – Univ Estadual Paulista, José Barbosa de Barros street, n. 1780, zip code 18610-307, Botucatu city, São Paulo State, Brazil, e-mail: luizvitorsanches@fca.unesp.br; majucarreiro@hotmail.com; rlvboas@fca.unesp.br; tfandrade@fca.unesp.br


    Keywords: composted sewage sludge, porosity, organic residue, physical structure


    The recycling of biosolids and any discarded material in urban centers may be able to add economic value and generate income through the products generated. There are several studies on the use of biosolids (BIO) in agriculture that prove its benefits, the most important being the supply of organic matter and water retention in the formulations of substrates.The objective was to evaluate the volume (%) of the total porosity, macro and microporosity in mixtures between BIO and carbonized rice husk (CRH) for use in agriculture. This study was conducted in the laboratory in the Department of Soil Science of the FCA/Univ. Estadual Paulista, Botucatu, Sao Paulo - Brazil. The experimental design was randomized blocks with seven treatments, three blocks and three replicates. Treatments: 100% BIO, 80:20% BIO:CRH, 60:40%, 50:50%, 40:60%, 20:80% e 100% CRH. The materials were placed into rings with a volume of 90,478 cm³ and allowed to saturate for 24 hours, after this period, the rings were placed in the tension table under tensions 0,1, 0,6 and 1,0 kPa, remaining for 48 hours each tension and measuring the weight in each time interval. Upon reaching constant weight the rings were dried with forced air circulation at a temperature of 65 ºC. Formulas: Percentage saturation = (saturated weight - dry weight) x 100/ring volume; microporosity = (0,6 kPa weight - dry weight) x 100/ring volume; macroporosity = Percent saturation - microporosity; Porosity = microporosity + macroporosity. The results were statistically analyzed using the Tukey test. With the increase of CRH an increase in porosity (69,6% BIO; 71,6%; 74,5%; 77,2%; 78,8%; 79,1% e 79,5% CRH respectively), and macroporosity (40,3% BIO; 44,4%; 49,3%; 54,1%; 56,5%; 60,4% e 62,1% CRH) and reduction in microporosity (29,3% BIO; 27,2%; 25,2%; 23,1%; 22,3%; 18,7% e 17,4% CRH).

    See more from this Division: ASA Section: Education & Extension
    See more from this Session: General Advancing Agronomy Via Public-Private Collaboration: II