A comparative study of farm nutrient budgets and nutrient flows of certified organic and non-organic farms in China, Brazil and Egypt

A comparative study of farm nutrient budgets and nutrient flows of certified organic and non-organic farms in China, Brazil and Egypt

Author Oelofse, Myles Google Scholar
Hogh-Jensen, Henning Google Scholar
Abreu, Lucimar S. Google Scholar
Almeida, Gustavo F. Autor UNIFESP Google Scholar
El-Araby, Ahmed Google Scholar
Hui, Qiao Yu Google Scholar
Neergaard, Andreas de Google Scholar
Institution Univ Copenhagen
Aarhus Univ
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Universidade Federal de São Paulo (UNIFESP)
Ain Shams Univ
China Agr Univ
Abstract Increased demand for certified organic products has led to an increase in the number of certified organic farms in developing countries. Knowledge of farmer nutrient management practices on certified organic farms in developing countries is limited. Thus, the aim of this study was to investigate the impact of the adoption of certified organic agriculture on farm nutrient flows and nutrient budgets, and evaluate to which degree organic farms comply with organic principles relating to nutrient management. the study is based on five case studies of different types of certified organic farming systems in Brazil, Egypt and China. Farm nutrient flows and nutrient budgets for nitrogen, phosphorous and potassium were created for each farm. Four of the five organic systems studied had nutrient surpluses on the farm budget. the surpluses were of varying magnitude. the main difference between organic and non-organic farm nutrient flows was the replacement of mineral fertilizers with organic inputs. However, the magnitude of nutrient flows were generally similar for organic and non-organic farms. Certified organic farms with positive nutrient budgets had a heavy reliance on external inputs. Continued high dependence on an external supply of nutrients, which typically originate from mineral sources, poses a significant challenge to organic farmers' fulfilment of the principles of organic agriculture.
Keywords Nutrient management
Nutrient budget
Farming systems analysis
Organic agriculture
Language English
Date 2010-07-01
Published in Nutrient Cycling in Agroecosystems. Dordrecht: Springer, v. 87, n. 3, p. 455-470, 2010.
ISSN 1385-1314 (Sherpa/Romeo, impact factor)
Publisher Springer
Extent 455-470
Origin http://dx.doi.org/10.1007/s10705-010-9351-y
Access rights Closed access
Type Article
Web of Science ID WOS:000279599500010
URI http://repositorio.unifesp.br/handle/11600/32670

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