Nutricion mineral

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Communications in Soil Science and Plant Analysis
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Nitrogen Fertilizer Losses from Rice Soils and Control of Environmental Pollution Problems
A. T. M. A. Choudhury a; I. R. Kennedy a a SUNFix Centre for Nitrogen Fixation, Faculty of Agriculture, Food and Natural Resources, Ross Street Building A03, The University of Sydney, NSW,Australia Online Publication Date: 01 June 2005

To cite this Article Choudhury, A. T. M. A. and Kennedy, I. R.(2005)'Nitrogen Fertilizer Losses from Rice Soils and Control of

Environmental Pollution Problems',Communications in Soil Science and Plant Analysis,36:11,1625 — 1639
To link to this Article: DOI: 10.1081/CSS-200059104 URL: http://dx.doi.org/10.1081/CSS-200059104

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Communications in Soil Science and Plant Analysis, 36: 1625–1639, 2005 Copyright # Taylor & Francis, Inc. ISSN 0010-3624 print/1532-2416 online DOI: 10.1081/CSS-200059104

Nitrogen Fertilizer Losses from Rice Soils and Control of Environmental Pollution Problems
Downloaded By: [Iowa State University] At: 15:07 24 August 2009

A. T. M.A. Choudhury and I. R. Kennedy
SUNFix Centre for Nitrogen Fixation, Faculty of Agriculture, Food and Natural Resources, Ross Street Building A03, The University of Sydney, NSW, Australia

Abstract: Nitrogen (N) requirements of rice crop are met from both the soil and fertilizers. Because of acute N deficiency in most rice soils, fertilizer N must be applied to meet the crop demand. N fertilizerapplied to rice crops is partially lost through different mechanisms, including ammonia volatilization, denitrification, and leaching. These losses may cause environmental problems such as polluting the atmosphere, aquatic systems, and groundwater. These problems cannot be alleviated completely. However, they can be reduced a considerable extent by various techniques. Research has been conductedaround the world to minimize N fertilizer losses. This paper reviews this information on N fertilizer losses, indicating management practices for minimizing these losses from the soil-water system. Keywords: Nitrogen losses, rice soils, environmental pollution

INTRODUCTION Rice is the main food crop of an estimated 40% of the world’s population (Buresh and De Datta 1990). The rice crop removeslarge amounts of N for its growth and grain production. The estimated amount of N removal ranges from 16 to 17 kg for the production of one ton of rough rice, including
Received 16 January 2004, Accepted 13 January 2005 Address correspondence to A. T. M. A. Choudhury, SUNFix Centre for Nitrogen Fixation, Faculty of Agriculture, Food and Natural Resources, Ross Street Building A03, The University...