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Potential of a D class fertilizer obtained from sewage sludge and solid waste for juçara Palm (Euterpe edulis) cultivation in an agroforestry system

Grant number: 15/05878-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2015
Effective date (End): August 31, 2016
Field of knowledge:Agronomical Sciences - Forestry Resources and Forestry Engineering - Forest Management
Principal researcher:Ricardo Augusto Gorne Viani
Grantee:Ana Carolina Cardoso de Oliveira
Home Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil


The uncontrolled extractive system of juçara palm (Euterpe edulis L.) in the Atlantic Forest and the increasing production of sludge from sewage treatment plants are distinct problems, but both affect natural resources conservation, requiring alternatives to mitigate their negative impacts. The sewage sludge when treated and processed acquires characteristics that allow its use in agriculture as an alternative fertilizer classified as D Class organic fertilizer according to the Brazilian legislation. This fertilizer provides nutrients, organic matter and humidity, and can act as a soil conditioner in various crop systems. Besides, the juçara palm is an endangered species, therefore, it is relevant to develop an alternative cultivation system aiming the reduction of its exploration in natural forests. This study aims to evaluate how E. edulis saplings cultivated in an agroforestry system with African mahogany (Khaya spp.) responds to different levels of organic fertilization. This experiment will be conducted at the Agricultural Sciences Center field, Federal University of São Carlos (UFSCar - Araras / SP), in an area with 400 African mahogany plants implanted in April 2013. The juçara palm will be planted among mahogany trees in an randomized blocks experimental design, considering five treatments: three different levels of D class organic fertilizer addition (2, 4 and 8 kg / plant), one with conventional mineral fertilization (NPK) and a control treatment without fertilization. After planting and organic fertilizer application, juçara palm plants will be periodically evaluated regarding growth in height and stem diameter. Ten months after planting, samples of soil surrounding the plants will be collected and analyzed for chemical and biological properties. The results will be compared among treatments using ANOVA and, if significant, by Tukey test. Organic fertilization will be compared to conventional fertilization aiming to find which level of organic fertilization could produce similar results as that found with mineral fertilization.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CARDOSO DE OLIVEIRA, ANA CAROLINA; GORNE VIANI, RICARDO AUGUSTO. Sewage sludge organic fertilizer as a promoter of initial growth of Euterpe edulis Mart., an endangered palm. INTERNATIONAL JOURNAL OF RECYCLING OF ORGANIC WASTE IN AGRICULTURE, v. 9, n. 2, p. 161-170, . (15/05878-0)

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