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Grant number: 12/11442-1
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): September 01, 2012
Effective date (End): January 31, 2014
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:Paulo Sergio Pavinato
Grantee:Ioná Rech
Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil


Urea is the most widely used nitrogen fertilizer in Brazil for the production of grains and fiber, it represents about 60% of the use of nitrogen sources. The main advantage of using urea in agriculture is the high nitrogen concentration (44-46%) and lowest price per unit of N. However, due to multiple chemical and biological reactions, urea may have higher losses due to volatilization of ammonia and also by nitrate leaching. Because of these loss factors, it is clear the importance of studying new technologies for production of fertilizers to increase efficiency in supplying nitrogen to crops. The main objective of this project is to develop formulations based on urea fertilizer by the addition of urease inhibitors and clay minerals to reduce N losses at the time of application to soil, both by volatilization and leaching, increasing agronomic efficiency. Some research studies have shown that these additives have a potential to reduce losses of nitrogen from urea. These formulations produced are going to be evaluated for their physical and chemical characteristics, as well as its efficiency in reduction of nitrate leaching, using PVC pipe soil columns, and ammonia volatilization through a open semi-static chamber, and also evaluation of a agronomic efficiency in a crop in greenhouse. This project will be developed in the Department of Soil Science ESALQ - USP, in partnership with EMBRAPA Solos, where the fertilizer will be developed at the Laboratory of Fertilizers Production Technology at EMBRAPA.

News published in Agência FAPESP Newsletter about the scholarship:
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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)
IONÁ RECH; JOSÉ CARLOS POLIDORO; PAULO SÉRGIO PAVINATO. Aditivos incorporados à ureia para reduzir perdas de nitrogênio após aplicação ao solo. Pesquisa Agropecuária Brasileira, v. 52, n. 3, p. 194-204, . (12/11442-1)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
RECH, Ioná. Production and evaluation of the efficiency of urea enriched with additives for the control of nitrogen release. 2014. Master's Dissertation - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) Piracicaba.

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Filed patent(s) as a result of this research project

FERTILIZANTE À BASE DE UREIA MICRONIZADA E SEU PROCESSO DE OBTENÇÃO BR1020150013310 - Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) ; Universidade de São Paulo (USP) . José Carlos Polidoro ; Ioná Rech ; Paulo Sergio Pavinato - January 2015, 21