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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