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Application of sewage sludge, lime and mud steel slag attributes and effects on the ground and chemical plant system in tillage

Grant number: 12/09604-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): August 01, 2012
Effective date (End): July 31, 2013
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal researcher:Leonardo Theodoro Bull
Grantee:Gustavo Ferreira Brandão
Home Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil


The use of no-tillage has become widespread in Brazil, ensuring more sustainable production. In this system, the maintenance of surface residues and does not cause soil disturbance, over the years, chemical changes, physical and biological characteristics that affect the dynamics of nutrients in the soil. The recycling of the waste in agricultural soils is one of the most rational use of these materials as a source of nutrients and improve soil characteristics if health and environmental criteria are met. Such waste may be of urban origins, such as sewage sludge and industrial origins, such as steelmaking slag or waste from pulp and paper industries. The application in no-tillage contributes to further increasing the organic matter content of soils, whose action complexing reduces the risk of contamination with metals from these materials. Aiming to combine the benefits of the system of soil management with tillage and application of sewage sludge and industrial waste into the soil under long-term experiment, the project aims to analyze the chemical changes in soil and plant oats after the application of sewage sludge, lime sludge and steel slag in Tillage System. This is work that has been conducted for ten years, and until now, there were five applications of such waste: 2002, 2005, 2007, 2009, and 2011. The experimental design is a randomized block design with four replications. The treatments consist of four residues, two sewage sludge (centrifuged and digester), and two industrial waste (steel slag and lime mud) at doses of 0, 2, 4, and 8 Mg ha-1. Fractionated through a characterization of the soil profile will be analyzed soil chemical characteristics, biomass production of oat, and leaf nutrient content.(AU)

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